Device for detecting stripping of shielding case

Abstract

The utility model discloses a device for detecting stripping of a shielding case, which comprises a base, the center of the top of the base is fixedly connected with the shielding case, a plurality of fixed points are fixedly connected, at least one fixed point in the plurality of fixed points is not grounded, and the rest fixed points are grounded; the ungrounded fixed point is electrically connected with the pull-up resistor and the series resistor respectively, the series resistor is electrically connected with the signal processing chip, and the pull-up resistor is electrically connected with the power supply. According to the utility model, the fixed points which are fixedly connected are classified, at least one fixed point is not grounded, and the rest fixed points are grounded; when the shielding case is normal, the ungrounded fixed points on the shielding case are grounded through other grounded fixed points, and if the signal processing chip reads that the level is low, the shielding case is not abnormal; otherwise, the shielding case is abnormal. According to the utility model, peeling of the shielding case can be found in time without dismounting the machine, and internal data can be prevented from being stolen after the shielding case is dismounted maliciously.

Description

Technical Field

[0001] The utility model relates to the technical field of electronics, in particular to a device for detecting peeling of a shielding cover. Background Art

[0002] Shielding covers, essential components for EMC (Electromagnetic Compatibility), are widely used in military, medical, industrial control, and electronics industries. Their primary function is to prevent electromagnetic interference generated within a device from impacting the external environment. They also block external electromagnetic interference from entering the device, protecting sensitive internal signals. Shielding covers also assist in heat dissipation, protect internal components from physical damage, conceal key device information, and safeguard internal data.

[0003] Typically, a shield case is a cubic box structure without solder terminals. It is mounted on a substrate, with its four sides attached to the substrate by soldering. When using the electronic device to which the substrate belongs, for example, sudden changes in ambient temperature can cause the substrate to shrink or warp, or the device to be dropped while in use, or the electronic circuit module to bend and warp when placed in a tight space. This can put significant stress on the soldered parts of the shield case, potentially causing the joints to peel. There are even cases where unscrupulous users forcibly disassemble the shield case, causing it to peel off, in order to steal data from the components on the substrate.

[0004] Timely detection of shielding cover peeling is of great significance to ensuring the normal operation of electronic equipment. Therefore, how to detect shielding cover peeling in time without disassembling the device is a technical problem that the industry urgently needs to solve. Utility Model Content

[0005] Purpose of the utility model: The purpose of the utility model is to provide a device for detecting the peeling of a shielding cover, which solves the current problem that the peeling of the shielding cover cannot be detected in time without disassembling the machine.

[0006] Technical solution: The utility model provides a device for detecting the peeling of a shielding cover, comprising a base, a shielding cover fixedly connected at the top center of the base, the fixed connection comprising several fixed points, at least one of the several fixed points being ungrounded, and the remaining fixed points being grounded; the ungrounded fixed points being electrically connected to a pull-up resistor and a series resistor, respectively, the series resistor being electrically connected to a signal processing chip, and the pull-up resistor being electrically connected to a power supply.

[0007] Furthermore, the shielding cover is a hollow rectangular box structure without a bottom surface.

[0008] Furthermore, a shielding cover is fixedly connected to the top center of the base, which means that square protrusions are provided at the bottom of the four side walls of the shielding cover, and a square groove for inserting the square protrusion is provided at the top center of the base, and the square protrusion is inserted into the square groove and fixed by welding.

[0009] Furthermore, the fixed points of the fixed connection are welding points.

[0010] Furthermore, the top center of the base is fixedly connected with a shielding cover, which means that a plurality of groups of clamps are fixedly provided at the top center of the base, and the bottom of the four side walls of the shielding cover are fixedly connected to the base through the clamps.

[0011] Furthermore, the fixed point of the fixed connection is the contact point between the clamp and the shielding cover.

[0012] Furthermore, the number of the ungrounded fixing points is two, and the two ungrounded fixing points are arranged diagonally symmetrically.

[0013] Furthermore, the number of the ungrounded fixed points is four, and the four ungrounded fixed points are distributed at four corners.

[0014] Furthermore, the model of the signal processing chip is STM32F103.

[0015] The beneficial effects of the present invention are as follows: the present invention classifies the fixed points of fixed connection, wherein at least one fixed point is not grounded, and the remaining fixed points are all grounded; the ungrounded fixed points are electrically connected to the series resistor and the signal processing chip; since the shielding cover is made of a metal conductive material, when the shielding cover is normal, the ungrounded fixed points on the shielding cover are grounded through other grounded fixed points, and at this time the signal processing chip reads a low level or uses the ADC function to read a voltage value in the low level range, which indicates that the shielding cover has no abnormality; when the shielding cover is disassembled or falls off, the ungrounded fixed points fail to be grounded, and the signal processing chip reads a high level or uses the ADC function to read a voltage value in the high level range, indicating that the grounded fixed points are disassembled or damaged, which indicates that the shielding cover has an abnormality. The present invention can promptly detect the peeling of the shielding cover without disassembling the machine, and prevent the theft of internal data after malicious disassembly of the shielding cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded view of the shielding cover and the base being welded and fixed to each other;

[0017] Figure 2 An exploded view of the shielding cover and the base clamp of the utility model;

[0018] Figure 3 This is a schematic diagram of the welding and fixing structure of the shielding cover and the base of the utility model;

[0019] Figure 4 This is a schematic diagram of the circuit connection for detecting shielding cover peeling in the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] As described in the background technology, it is currently impossible to detect the peeling of the shielding cover in time without disassembling the device. It can be seen that timely detection of the peeling of the shielding cover is of great significance to ensuring the normal operation of the electronic equipment. In view of this, the present application proposes a device for detecting the peeling of the shielding cover.

[0022] The device includes a base 1, a shielding cover 2 is fixedly connected to the top center of the base 1, and the shielding cover 2 is a hollow rectangular box structure without a bottom surface. Figure 1 As shown, the base 1 and the shielding cover 2 are fixedly connected by: a square protrusion 3 is provided at the bottom of the four side walls of the shielding cover 2, a square groove 4 for inserting the square protrusion 3 is provided at the top center of the base 1, and the square protrusion 3 is inserted into the square groove 4 and fixed by welding; or Figure 2 As shown, the base 1 and the shielding cover 2 are fixedly connected, which means that a plurality of sets of clamps 5 are fixedly provided at the top center of the base 1, and the bottom of the four side walls of the shielding cover 2 are fixedly connected to the base 1 through the clamps 5. In this embodiment, the above two examples are used to illustrate that the base 1 and the shielding cover 2 are fixedly connected. Of course, there are many ways of fixed connection, and this embodiment does not give examples one by one.

[0023] like Figure 3 As shown, the fixed connection includes several fixing points 6. When the base 1 and the shielding cover 2 are fixedly connected by welding, the fixed connection points 6 are welding points; when the base 1 and the shielding cover 2 are fixedly connected by the clamp 5, the fixed connection points 6 are contact points between the clamp and the shielding cover.

[0024] Among them, at least one fixed point among the multiple fixed points 6 is not grounded, and the remaining fixed points are all grounded. The only difference between the ungrounded fixed point 61 and the grounded fixed point 62 is that they are grounded or not grounded. When the number of ungrounded fixed points 61 is two, the two ungrounded fixed points 61 can be arranged diagonally symmetrically. When the number of ungrounded fixed points 61 is four, the four ungrounded fixed points 61 can be distributed in four corners. It can be seen that when multiple ungrounded fixed points 61 are selected, the diagonal arrangement can be selected for better reliability, and they are individually pulled up and not connected to the ground plane, that is, not grounded.

[0025] like Figure 4As shown, the ungrounded fixed point 61 is electrically connected to the pull-up resistor 7 and the series resistor 8 respectively, the series resistor 8 is electrically connected to the signal processing chip 9, and the pull-up resistor 7 is electrically connected to the power supply 10. The pull-up resistor 7 selects a matching resistance value according to the GPIO (General-purpose input / output) current sinking capability of the signal processing chip 9. The pull-up level selects a level that matches the GPIO of the signal processing chip 9. The ungrounded fixed point 61 serves as the signal source to be detected and is connected to the GPIO of the signal processing chip 9 through the series resistor 8. The series resistor 8 normally uses a resistor of, for example, 22 ohms. The model of the signal processing chip 9 can be STM32F103. Since the shielding cover 2 is made of metal conductive material, it can be regarded as a wire. The ungrounded fixed point 61 and the grounded fixed point 62 are equivalent to being electrically connected through a wire, so they are illustrated in the form of a wire in the accompanying drawings.

[0026] Since shield cover 2 is made of conductive metal, when shield cover 2 is properly in place and the device is operating normally, the ungrounded fixed point 61 on shield cover 2 is grounded through other grounded fixed points 62. Therefore, the detected fixed point 61 will also be at the same potential as the ground plane. Therefore, the GPIO of signal processing chip 9 reads a low level, or the ADC (analog-to-digital converter, i.e., A / D converter, or ADC) function reads a voltage value in the low range. This is a normal state, indicating that shield cover 2 has not experienced any abnormality. When shield cover 2 is disassembled or falls off, the ungrounded fixed point 61 is not grounded. The GPIO of signal processing chip 9 reads a high level at detected fixed point 61, or the ADC function reads a voltage value in the high range. This indicates that detected fixed point 61 is no longer electrically connected to the ground plane, and the grounded fixed point 62 is disassembled or damaged, indicating that shield cover 2 has experienced any abnormality. When the GPIO of the signal processing chip 9 detects a high level or uses the ADC function to read a voltage value in the high level range, that is, an abnormality occurs, it can be known that the shielding cover 2 is peeled off, and the staff can protect the electronic equipment in time to prevent malicious removal of the shielding cover and theft of internal data.

[0027] The present invention first classifies the fixed points 6 of the fixed connection, wherein at least one fixed point is not grounded and the remaining fixed points are all grounded, and the ungrounded fixed point 61 is electrically connected to the series resistor 8 and the signal processing chip 9; once the shielding cover 2 is disassembled or falls off, the GPIO of the signal processing chip 9 can detect a high level or use the ADC function to read a voltage value in the high level range, that is, when the shielding cover 2 is abnormal. It can be seen that the present invention can promptly detect the peeling of the shielding cover 2 without disassembling the machine, thereby preventing the malicious theft of internal data after the shielding cover 2 is removed.

Claims

1. A device for detecting shielding cover peeling, characterized in that: The invention comprises a base, wherein a shielding cover is fixedly connected to the top center of the base, wherein the fixed connection includes several fixed points, at least one of the several fixed points is not grounded, and the remaining fixed points are all grounded; the ungrounded fixed points are electrically connected to a pull-up resistor and a series resistor respectively, the series resistor is electrically connected to a signal processing chip, and the pull-up resistor is electrically connected to a power supply.

2. The device for detecting shielding cover peeling according to claim 1, characterized in that: The shielding cover is a hollow rectangular box structure without a bottom surface.

3. The device for detecting shielding cover peeling according to claim 1, characterized in that: The top center of the base is fixedly connected with a shielding cover, which means that square protrusions are provided at the bottom of the four side walls of the shielding cover, and a square groove for inserting the square protrusion is provided at the top center of the base, and the square protrusion is inserted into the square groove and fixed by welding.

4. The device for detecting shielding cover peeling according to claim 3, characterized in that: The fixed points of the fixed connection are welding points.

5. The device for detecting shielding cover peeling according to claim 1, characterized in that: The shielding cover is fixedly connected to the top center of the base, which means that a plurality of groups of clamps are fixedly provided at the top center of the base, and the bottom of the side walls around the shielding cover are fixedly connected to the base through the clamps.

6. The device for detecting shielding cover peeling according to claim 5, characterized in that: The fixed point of the fixed connection is the contact point between the clamp and the shielding cover.

7. The device for detecting shielding cover peeling according to claim 1, characterized in that: There are two ungrounded fixing points, and the two ungrounded fixing points are arranged diagonally symmetrically.

8. The device for detecting shielding cover peeling according to claim 1, characterized in that: The number of the ungrounded fixing points is four, and the four ungrounded fixing points are distributed at four corners.

9. The device for detecting shielding cover peeling according to claim 1, characterized in that: The model of the signal processing chip is STM32F103.

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