Cover opening detection structure, secrecy system and cover opening detection method
By using a cover-opening detection structure consisting of a metal cover and multiple metal springs in the secure device, the problem of existing detection methods being easily cracked is solved, achieving highly sensitive cover-opening detection and enhancing the security of the secure device.
Patent Information
- Application Number
- CN202511719036.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-02-27
AI Technical Summary
Existing methods for detecting open-lid devices are easily cracked and lack sensitivity, making it difficult to effectively protect secure equipment.
The cover-opening detection structure consists of a metal cover, a PCB, and multiple metal springs. The multiple metal springs abut against the metal cover, connecting resistors and the ADC pins of control devices to form multi-point detection, thereby improving detection sensitivity.
It enhances the sensitivity and uncrackability of the cover opening detection, enabling it to quickly and accurately detect the opening or movement of the cover, thus improving the security of the security equipment.
Smart Images
Figure CN121586202A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of security technology, and in particular to a cover opening detection structure, a security system and a cover opening detection method. BACKGROUND
[0002] There are some special equipment use scenarios that need to be kept secret, which need to cover all electronic components with a metal cover, and use a cover opening detection method to prevent the cover from being opened at will, so as to achieve the purpose of security.
[0003] Current cover opening detection generally uses single-point contact or electromagnetic induction methods, but these methods have some shortcomings, such as only one contact point, and they are easily cracked. SUMMARY
[0004] The present application solves the problem of providing a cover opening detection structure, a security system and a cover opening detection method.
[0005] In a first aspect, the present application discloses a cover opening detection structure, comprising: a metal cover body, a PCB and a plurality of metal springs; the metal cover body is arranged above the PCB to form a security space between the inner wall of the metal cover body and the upper end surface of the PCB, and the upper end surface of the PCB is provided with a first electronic device, a second electronic device, a first resistor and a plurality of second resistors; the first electronic device is a control type device, the first end of the plurality of metal springs abuts against the inner wall of the metal cover body; the second end of the plurality of metal springs is connected to the second end of the plurality of second resistors one by one, the first end of the plurality of second resistors is connected to the ADC pin of the control type device and the second end of the first resistor at the same time, and the first end of the first resistor is connected to the output end of the VCC power supply.
[0006] In some embodiments, the cover opening detection structure further comprises a side shell, the bottom end of the side shell is connected to the upper end surface of the PCB, the top end of the side shell is connected to the bottom wall of the metal cover body, and the first end of the plurality of metal springs abuts against the bottom wall of the metal cover body.
[0007] In some embodiments, the plurality of metal springs are arranged uniformly or non-uniformly below the metal cover body.
[0008] In some embodiments, the metal cover body comprises a top cover and a side cover, the bottom end of the side cover is connected to the upper end surface of the PCB, the bottom wall of the top cover is connected to the top end of the side cover, and the first end of the plurality of metal springs abuts against the bottom wall of the metal cover body.
[0009] In some embodiments, the plurality of metal springs are arranged uniformly or non-uniformly below the top cover.
[0010] In some embodiments, the control type device is a chip with ADC function.
[0011] In some embodiments, the ADC bit number in the chip is one of 8bit, 12bit or 14bit.
[0012] In some embodiments, the resistance of the first resistor is 1kΩ, the number of the second resistors is four, the resistance of each second resistor is 10kΩ, and the output voltage of the VCC power supply is 3.3V.
[0013] In the second aspect, the application discloses a security system comprising the cover opening detection structure.
[0014] In the third aspect, the application discloses a cover opening detection method applied in the security system, and the method comprises the following steps. If the voltage signal on the ADC pin is detected to change, a security instruction is sent to the execution end; The execution end executes a security measure in response to the security instruction.
[0015] The application has the following beneficial effects: the cover opening detection structure, the security system and the cover opening detection method disclosed by the application, the cover opening detection structure comprises a metal cover body, a PCB and a plurality of metal springs; the metal cover body is arranged above the PCB to form a security space between the inner wall of the metal cover body and the upper end surface of the PCB; the upper end surface of the PCB is provided with a first electronic device, a second electronic device, a first resistor and a plurality of second resistors; the first electronic device is a control type device; the first ends of the plurality of metal springs are in abutment with the inner wall of the metal cover body; the second ends of the plurality of metal springs are connected to the second ends of the plurality of second resistors one by one; the first ends of the plurality of second resistors are connected to the ADC pin of the control type device and the second end of the first resistor; and the first end of the first resistor is connected to the output end of the VCC power supply. By arranging the plurality of metal springs in abutment with the metal cover body, the sensitivity of the cover opening detection is improved, and the difficulty of cracking is increased. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0017] Figure 1 The structural schematic diagram of the cover opening detection structure provided by the embodiments of the application is shown in the figure. Figure 2 The circuit schematic diagram of the cover opening detection structure provided by the embodiments of the application is shown in the figure.
[0018] Reference numeral: 1, metal cover body; 2, PCB; 3, metal spring; 4, first electronic device; 5, second electronic device; 6, first resistor; 7, second resistor; 8, VCC power supply. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.
[0020] It should be understood that the terms "comprising" and "including" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.
[0021] It should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "arranging" and the like should be interpreted broadly, for example, they can be fixedly connected, or detachably connected, or integrated; they can be mechanically connected, or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium; they can be internal communication of two elements or interaction relationship between two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" on the other element, or there can be one or more intervening elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0022] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and do not intend to limit the present application. As used in the specification and the appended claims of the present application, unless otherwise clear from the context, the singular forms "a", "an" and "the" are intended to include the plural forms.
[0023] It should also be further understood that the terms “and” and “or” as used in this specification and the appended claims refer to any combination of one or more of the associated listed items and all possible combinations, and include such combinations.
[0024] like Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the opening detection structure provided in an embodiment of the present invention; Figure 2 This is a circuit diagram of an opening detection structure provided in an embodiment of the present invention. The present invention discloses an opening detection structure including a metal cover 1, a PCB 2, and multiple metal springs 3; the metal cover 1 is disposed on top of the PCB 2, so that a confidential space is formed between the inner wall of the metal cover 1 and the upper surface of the PCB 2. The upper surface of the PCB2 is provided with a first electronic device 4, a second electronic device 5, a first resistor 6, and a plurality of second resistors 7; the first electronic device 4 is a control device, the first ends of the plurality of metal springs 3 abut against the inner wall of the metal cover 1; the second ends of the plurality of metal springs 3 are connected one by one to the second ends of the plurality of second resistors 7, the first ends of the plurality of second resistors 7 are simultaneously connected to the ADC pin of the control device and the second end of the first resistor 6, and the first end of the first resistor 6 is connected to the output terminal of the VCC power supply 8.
[0025] In this embodiment, the cover-opening detection structure can be applied in fields such as encrypted SSDs or encrypted motherboards. The metal spring 3 can be made of beryllium copper alloy, which has excellent conductivity and elasticity. The metal cover 1 protects the internal electronic components and also acts as a ground plane, thus working with the metal spring 3 to keep the electronic components confidential. The second electronic component 5 on the PCB2 is the electronic component that needs to be protected or kept confidential.
[0026] Specifically, the VCC power supply 8 is also mounted on PCB2. The number of second resistors 7 is the same as the number of metal springs 3 and they correspond one-to-one. The second resistors 7 are used for voltage division. The second end of the metal spring 3 is connected to the second end of the second resistor 7 and also to the upper surface of PCB2, and is in a vertical position. That is, the two ends of the metal spring 3 are compressed by PCB2 and metal cover 1. On the one hand, this makes the circuit structure conductive. On the other hand, the metal spring 3 is more sensitive when it is compressed and can more accurately detect changes in the metal cover 1 at its first end, such as when the metal cover 1 is opened or moved.
[0027] When the metal cover is opened or moved, one or more metal springs 3 that were in contact with the metal cover 1 will no longer be in contact with the metal cover 1. Since the circuit branch containing the corresponding metal spring 3 is not connected to GND, the control device can immediately detect the voltage change of the ADC pin, thus quickly detecting the opening action. Because multiple metal springs 3 are set, multiple contact points can be formed with the metal cover 1, resulting in a larger detection range, higher detection accuracy, and greater difficulty in being cracked. For example, the contact points can be arranged at intervals under the metal cover 1. As long as the metal cover 1 is translated, flipped, or partially damaged, the contact between the corresponding part of the metal spring 3 and the metal cover 1 will be released, thus detecting the translation, flipping, or damage of the metal cover 1.
[0028] In one embodiment, the cover opening detection structure further includes a side shell, the bottom end of which is connected to the upper surface of the PCB2, the top end of which is connected to the bottom wall of the metal cover 1, and the first ends of the plurality of metal springs 3 abut against the bottom wall of the metal cover 1.
[0029] In this embodiment, the metal cover 1 and the side shell together form the outer shell of the opening detection structure. A confidential space is formed between the inner wall of the metal cover 1, the inner wall of the side shell, and the upper surface of the PCB 2. The bottom end of the side shell is fixedly connected to the upper surface of the PCB 2, meaning the side shell is stationary. The metal cover 1 is located on top of the detection shell. When the metal cover 1 is opened, it can be translated or flipped. Translation means movement within the plane of the metal cover 1, which can be a linear translation or a rotation within the plane. Flipping means rotation along a horizontal axis from top to bottom or from bottom to top.
[0030] In this embodiment, the plurality of metal springs 3 are arranged uniformly or non-uniformly below the metal cover 1. If the plurality of metal springs 3 are uniformly arranged below the metal cover 1, multiple positions in the plane of the metal cover 1 can be detected with the same detection probability, for example, in a rectangular array with fixed horizontal and vertical intervals. If the plurality of metal springs 3 are non-uniformly arranged below the metal cover 1, a certain area can be focused for key detection. For example, when the metal cover 1 is opened by flipping, a relatively larger number of metal springs 3 can be set near the rotation axis. Alternatively, a relatively larger number of metal springs 3 can be set in the central area of the metal cover 1, because the central area of the metal cover 1 is more easily damaged.
[0031] In another embodiment, the metal cover 1 includes a top cover and a side cover, the bottom end of the side cover is connected to the upper end face of the PCB 2, the bottom wall of the top cover is connected to the top end of the side cover, and the first end of the plurality of metal springs 3 abuts against the bottom wall of the metal cover 1.
[0032] In this embodiment, the metal cover 1 itself is the outer shell of the cover opening detection structure. A confidential space is formed between the inner wall of the metal cover 1 and the upper surface of the PCB 2, meaning that when the metal cover 1 is opened, the entire metal cover 1 can be moved upwards. When the metal cover 1 is placed on top of the PCB 2, it is compressed by the PCB 2 and the top cover at the upper and lower ends of the multiple metal springs 3.
[0033] In this embodiment, the plurality of metal springs 3 are arranged uniformly or unevenly below the top cover. Their function can be referred to in the previous embodiment, and will not be repeated here.
[0034] In one embodiment, the control device is a chip with ADC (Analog-to-Digital Converter) function, the ADC bit width of the chip is one of 8 bits, 12 bits or 14 bits, the resistance of the first resistor 6 is 1 kΩ, the number of the second resistors 7 is set to four, the resistance of each second resistor 7 is 10 kΩ, and the output voltage of the VCC power supply 8 is 3.3V.
[0035] In this embodiment, the chip with ADC function can be, for example, an MCU. The number of metal springs 3 and the second resistor 7 are the same, for example, four each, and they are set according to the connection method described above. When all four metal springs 3 are in contact with the metal cover 1, the voltage of the ADC pin can be calculated as follows: 3.3*[(10 / 4) / (1+10 / 4)]=2.36V; When one of the metal springs 3 is not in contact with the metal cover 1, the voltage at the ADC pin is: 3.3*[(10 / 3) / (1+10 / 3)]=2.53V; Therefore, the voltage change at the ADC pin is 2.53V - 2.36V = 0.17V = 170mV. Taking a 12-bit ADC as an example, its sampling accuracy can be accurate to 2mV. Therefore, even if one metal spring 3 is not in contact with the metal cover 1, it can still be detected. Although theoretically, the more resistors connected in parallel, the smaller the voltage fluctuation caused by one not making contact, 170mV is much greater than 2mV. With proper design, more metal springs 3 can be added as needed, for example, by using an MCU with a higher sampling accuracy ADC or adjusting the resistance values of the first resistor 6 and the second resistor 7. This embodiment can implement the entire circuit using only one ADC pin of the MCU, resulting in low design complexity.
[0036] Understandably, in other embodiments, the output voltage of the VCC power supply 8, the number of ADC bits in the chip, the resistance value of the first resistor 6, the resistance value and number of the second resistor 7 can be adjusted according to actual needs, so as to ensure that even if the contact between a metal spring 3 and the metal cover 1 is released, the voltage fluctuation generated is greater than the sampling progress of the ADC.
[0037] This invention also provides a security system, including the cover opening detection structure provided in the above embodiments.
[0038] This invention also provides a method for detecting open caps. In the security system described in the above embodiments, the method includes: If a change in the voltage signal on the ADC pin is detected, a confidential command is sent to the execution end; The execution terminal responds to the confidentiality instruction by performing confidentiality measures.
[0039] In this embodiment, if a change in the voltage signal on the ADC pin is detected, the MCU sends a security command to the execution terminal. The security measures performed by the execution terminal may include issuing an alarm message, deleting software data, or burning out hardware.
[0040] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A lid-opening detection structure, characterized in that, The device includes a metal cover, a PCB, and multiple metal springs. The metal cover is positioned over the PCB to create a secure space between the inner wall of the metal cover and the upper surface of the PCB. The upper surface of the PCB is provided with a first electronic device, a second electronic device, a first resistor, and multiple second resistors. The first electronic device is a control device. The first ends of the multiple metal springs abut against the inner wall of the metal cover. The second ends of the multiple metal springs are connected to the second ends of the multiple second resistors. The first ends of the multiple second resistors are simultaneously connected to the ADC pin of the control device and the second end of the first resistor. The first end of the first resistor is connected to the output terminal of the VCC power supply.
2. The cover opening detection structure according to claim 1, characterized in that, The cover opening detection structure also includes a side shell, the bottom end of which is connected to the upper surface of the PCB, the top end of which is connected to the bottom wall of the metal cover, and the first end of the plurality of metal springs abuts against the bottom wall of the metal cover.
3. The cover opening detection structure according to claim 2, characterized in that, The plurality of metal springs are arranged uniformly or unevenly below the metal cover.
4. The cover opening detection structure according to claim 1, characterized in that, The metal cover includes a top cover and a side cover. The bottom end of the side cover is connected to the upper surface of the PCB, the bottom wall of the top cover is connected to the top end of the side cover, and the first ends of the plurality of metal springs abut against the bottom wall of the metal cover.
5. The cover opening detection structure according to claim 4, characterized in that, The plurality of metal springs are arranged uniformly or unevenly below the top cover.
6. The cover opening detection structure according to claim 1, characterized in that, The control device is a chip with ADC functionality.
7. The cover opening detection structure according to claim 6, characterized in that, The ADC bit depth in the chip is one of 8 bits, 12 bits, or 14 bits.
8. The cover opening detection structure according to claim 7, characterized in that, The first resistor has a resistance of 1 kΩ, the second resistor has four components, each with a resistance of 10 kΩ, and the VCC power supply outputs 3.3V.
9. A security system, characterized in that, Includes the lid opening detection structure as described in any one of claims 1-8.
10. A method for detecting a lid being opened, characterized in that, In the security system of claim 9, the method comprises: If a change in the voltage signal on the ADC pin is detected, a confidential command is sent to the execution end; The execution terminal responds to the confidentiality instruction by performing confidentiality measures.