CN107368759B - Equipment anti-disassembly system - Google Patents
Equipment anti-disassembly system Download PDFInfo
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- CN107368759B CN107368759B CN201710770896.5A CN201710770896A CN107368759B CN 107368759 B CN107368759 B CN 107368759B CN 201710770896 A CN201710770896 A CN 201710770896A CN 107368759 B CN107368759 B CN 107368759B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/86—Secure or tamper-resistant housings
- G06F21/87—Secure or tamper-resistant housings by means of encapsulation, e.g. for integrated circuits
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Abstract
The invention discloses an equipment anti-disassembly system, which can control the inside of equipment to be locked when the equipment is disassembled in a power-down state; when the upper cover of the equipment is opened, the equipment is firstly connected to an internal power supply circuit in the equipment through a two-way switch, and the external normal power supply circuit of the equipment is cut off; then, the voltage dividing circuit is communicated with the internal power supply circuit through a two-way switch, and the voltage dividing circuit generates an internal voltage dividing value; finally, after the detection circuit detects the internal partial pressure value, the equipment is judged to be disassembled, and then the disassembly prevention function is executed to lock the equipment. The equipment anti-disassembly system provided by the invention does not need to be designed into a complex mechanical structure, and only needs to protect the functional information of the equipment through the equipment anti-disassembly system in the equipment, so that the burden of designers and installers of the equipment anti-disassembly system is reduced. When the equipment is opened, the equipment is automatically powered off, and the anti-dismantling function of the equipment anti-dismantling system can be realized without normal power-on, so that the equipment is locked to protect the function information of the equipment.
Description
Technical Field
The invention relates to the field of tamper detection, in particular to an equipment tamper system.
Background
With the continuous development of society, people pay more and more attention to the safety of equipment function information, so that more and more electrical equipment is provided with an equipment anti-disassembly system so as to protect the function information safety of the electrical equipment. The security of the equipment function information is directly determined by the superiority of the equipment anti-dismantling system of the electrical equipment.
The existing equipment anti-disassembly system of the electrical equipment can realize the anti-disassembly function only after the electrical equipment is normally electrified, and the equipment anti-disassembly system of the disassembled electrical equipment is easily found by a thief, so that the thief can destroy or avoid the equipment anti-disassembly system; therefore, the anti-dismantling function of the equipment cannot be started, the electrical equipment is still powered on and works normally, and the function information of the electrical equipment cannot be well protected. And, partly equipment is prevented tearing open system and is mostly adopted mechanical structure and design structure is fairly complicated, has increased equipment and has prevented tearing open system's designer and installer's burden.
Therefore, how to solve the problems that the structural design of the equipment anti-disassembly system of the equipment is complex, and the equipment anti-disassembly system can realize the anti-disassembly function after the equipment is normally powered on is a problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide an equipment anti-dismantling system, which solves the problems that the structural design of the equipment anti-dismantling system is complex and the equipment anti-dismantling system can realize the anti-dismantling function after the equipment is normally electrified in the prior art.
In order to solve the above technical problems, in one aspect, the present invention provides an apparatus tamper-proof system, including:
a two-way switch arranged on the inner side of the upper cover of the equipment;
when the upper cover of the equipment is pressed down, the two-way switch connects the voltage dividing circuit to an external power supply circuit; when the upper cover of the equipment is opened, the two-way switch connects the voltage dividing circuit to an internal power supply circuit;
and the detection circuit is connected with the voltage dividing circuit and used for detecting the voltage dividing value of the voltage dividing circuit.
Preferably, a first end of an external power supply in the external power supply circuit is connected with a normally-closed contact of the bidirectional switch, and a second end of the external power supply is connected with a second end of the voltage dividing circuit; and a first end of an internal power supply in the internal power supply circuit is connected with the normally open contact of the two-way switch, and a second end of the internal power supply is connected with a second end of the voltage dividing circuit.
Preferably, the first voltage dividing resistor and the second voltage dividing resistor;
the first end of the first voltage dividing resistor is connected with the movable contact of the two-way switch, and the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor; and the second end of the second voltage dividing resistor is connected with the second end of the external power supply and the second end of the internal power supply.
Preferably, the method further comprises: one end of the voltage stabilizing circuit is connected with the movable contact of the two-way switch, and the other end of the voltage stabilizing circuit is connected with the detection circuit.
Preferably, the voltage stabilizing circuit includes: the first voltage stabilizing chip is connected with the movable contact of the bidirectional switch and used for converting the voltage value of an external power supply or the voltage value of an internal power supply connected with the bidirectional switch into a first stable voltage value; the second voltage stabilizing chip is connected with the first voltage stabilizing chip and is used for converting a first stable voltage value output by the first voltage stabilizing chip into a second stable voltage value, and the other end of the second voltage stabilizing chip is connected with the detection circuit.
Preferably, the detection circuit includes: a control chip and a power-down storage device;
the first end of the control chip is connected with the second end of the first voltage dividing resistor, the second end of the control chip is connected with the voltage stabilizing circuit, and the third end of the control chip is connected with the power-down storage device.
Preferably, the method further comprises: and the IIC bus is used for communicating the control chip and the power-down storage device.
Preferably, the bidirectional switch is a spring normally open and normally closed bidirectional switch.
Preferably, the power-down storage device is an EEPROM or FLASH inside the control chip.
Compared with the prior art, the equipment anti-disassembly system provided by the embodiment of the invention can lock the equipment when the equipment is disassembled in a power-down state; when the upper cover of the equipment is opened, the equipment is firstly connected to an internal power supply circuit in the equipment through a two-way switch, and the external normal power supply circuit of the equipment is cut off; then, the voltage dividing circuit is communicated with the internal power supply circuit through a two-way switch, and the voltage dividing circuit generates an internal voltage dividing value; finally, after the detection circuit detects the internal partial pressure value, the device is judged to be disassembled. And further executing the anti-disassembly function to lock the equipment function information. Therefore, the equipment anti-disassembly system provided by the invention does not need to be designed into a complex mechanical structure, and only needs to protect the functional information of the equipment through the equipment anti-disassembly system in the equipment, so that the burden of designers and installers of the equipment anti-disassembly system is reduced. And secondly, after the equipment is opened, the equipment is automatically powered off, and the anti-dismantling function of the equipment anti-dismantling system can be realized without normal power-on, so that the equipment is locked to protect the function information of the equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be selected according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an anti-disassembling system for equipment according to an embodiment of the present invention;
FIG. 2 is a block diagram of another tamper evident system of the present invention;
FIG. 3-1 is an electrical schematic diagram of a first tamper evident system according to an embodiment of the present invention;
fig. 3-2 is an electrical schematic diagram of a second type of tamper evident system according to an embodiment of the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an equipment anti-dismantling system, which solves the problems that the structural design of the equipment anti-dismantling system of the existing equipment is complex, and the equipment anti-dismantling system can realize the anti-dismantling function after the equipment is normally electrified.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a schematic structural diagram of an anti-disassembling system for a device according to an embodiment of the present invention, as shown in fig. 1, including:
a two-way switch 10 provided inside the upper cover of the apparatus;
specifically, the bidirectional switch 10 in this embodiment is a switch that automatically switches and connects an internal power supply circuit of the device or an external power supply circuit of the device when the upper cover of the device is opened or closed by a spring.
When the upper cover of the device is pressed down, the two-way switch 10 connects the voltage dividing circuit 40 to the external power supply circuit 30; when the upper cover of the device is opened, the two-way switch 10 connects the voltage dividing circuit to the internal power supply circuit 20;
specifically, the voltage dividing circuit 40 in this embodiment is a circuit composed of at least one resistor, and generates different voltage dividing values when the bidirectional switch 10 is connected to the external power supply circuit 30 or the internal power supply circuit 20. The number and type of the voltage dividing resistors are not limited herein.
And a detection circuit 50 connected to the voltage dividing circuit 40 for detecting the divided value of the voltage dividing circuit 40.
Specifically, the detection circuit 50 in this embodiment is a voltage division value detection circuit for detecting the voltage division value of the voltage division circuit 40, and stores the uncapped state flag bit corresponding to the voltage division value after detecting that the voltage division value of the voltage division circuit 40 exceeds a preset threshold, so that when the main program is executed, after detecting the uncapped state flag bit, the equipment is automatically locked, and the equipment information security is ensured.
Compared with the prior art, the equipment anti-disassembly system provided by the invention has the advantages that when the upper cover of the equipment is opened, the equipment anti-disassembly system is firstly connected to an internal power supply circuit inside the equipment through the two-way switch, and the external normal power supply circuit of the equipment is cut off; then, the voltage dividing circuit is communicated with the internal power supply circuit through a two-way switch, and the voltage dividing circuit generates an internal voltage dividing value; finally, after the detection circuit detects the internal partial pressure value, the device is judged to be disassembled. And further executing the anti-disassembly function to lock the equipment function information. Therefore, the equipment anti-disassembly system provided by the invention does not need to be designed into a complex mechanical structure, and only needs to protect the functional information of the equipment through the equipment anti-disassembly system in the equipment, so that the burden of designers and installers of the equipment anti-disassembly system is reduced. And secondly, after the equipment is opened, the equipment is automatically powered off, and the anti-dismantling function of the equipment anti-dismantling system can be realized without normal power-on, so that the equipment is locked to protect the function information of the equipment.
Based on the above-described embodiment, in the present embodiment, as a preferred embodiment, the first terminal of the external power supply in the external power supply circuit 30 is connected to the normally-closed contact of the bidirectional switch 10, and the second terminal of the external power supply is connected to the second terminal of the voltage dividing circuit 40. A first terminal of an internal power supply in the internal power supply circuit 20 is connected to the normally open contact of the bidirectional switch 10, and a second terminal of the internal power supply is connected to a second terminal of the voltage dividing circuit 40.
Specifically, in order to make the voltage dividing effect of the voltage dividing circuit 40 more obvious, the external power source may be a power source with a 12V power supply voltage, and the internal power source may be a power source with a 6V power supply voltage.
Based on the above-described embodiment, in the present embodiment, as a preferred embodiment, the voltage dividing circuit 40 includes the first voltage dividing resistor, the second voltage dividing resistor; the first end of the first voltage dividing resistor is connected with the movable contact of the two-way switch, and the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor; the second end of the second voltage dividing resistor is connected with the second end of the external power supply and the second end of the internal power supply.
It should be noted that the number and the resistance of the voltage dividing resistors in the voltage dividing circuit 40 in the embodiment of the present invention may be selected according to practical situations, and are not limited herein.
Fig. 2 is a block diagram of another anti-disassembling system for equipment according to an embodiment of the present invention. As shown in fig. 2, in order to make the anti-dismantling system of the device provided by the embodiment of the invention more perfect and friendly, as a preferred implementation manner, the anti-dismantling system of the device further comprises a voltage stabilizing circuit 60, one end of which is connected with the movable contact of the bidirectional switch 10, and the other end of which is connected with the detection circuit 50.
In order to obtain a more stable power supply voltage for the detection circuit 50, the voltage stabilizing circuit 60 includes, as a preferred embodiment: the first voltage stabilizing chip is connected with the movable contact of the bidirectional switch 10 and is used for converting the voltage value of an external power supply or the voltage value of an internal power supply connected with the bidirectional switch 10 into a first stable voltage value;
the second voltage stabilizing chip is connected with the first voltage stabilizing chip and is used for converting a first stable voltage value output by the first voltage stabilizing chip into a second stable voltage value, and the other end of the second voltage stabilizing chip is connected with the detection circuit 50.
Preferably, in order for the voltage stabilizing circuit to output a stable voltage with higher precision, the first voltage stabilizing chip may be an LM2596 voltage stabilizing chip, the second voltage stabilizing chip may be an ASM 1117-3.3 voltage stabilizing chip, and of course, it will be understood that, according to practical situations, the number and types of voltage stabilizing chips included in the voltage stabilizing circuit may be other voltage stabilizing chips, which are not limited herein.
Based on the above embodiment, in this embodiment, in order to detect the voltage division value of the voltage division circuit 40 in real time and store the status flag bit generated after the voltage division value is detected, as a preferred embodiment, the detection circuit 50 includes a control chip and a power-down storage device; the first end of the control chip is connected with the second end of the first voltage dividing resistor, the second end of the control chip is connected with the voltage stabilizing circuit, and the third end of the control chip is connected with the power-down storage device.
Based on the above embodiment, in this embodiment, in order to facilitate data transmission between the control chip in the detection circuit 50 and the power-down storage device, as a preferred implementation manner, the embodiment of the present invention further includes: the IIC bus used for communication between the control chip and the power-down storage device is not limited herein, and the communication manner between the control chip and the power-down storage device may be selected according to the actual situation, where the control chip may select a chip suitable for the environment according to the actual situation, and is not limited herein.
Based on the above embodiment, in this embodiment, in order to make the storage of the status flag bit of the device obtained by the control chip more reliable, as a preferred embodiment, the power-down storage device is an EEPROM or a FLASH inside the control chip, where the power-down storage chip AT24C04 may be selected as the power-down storage device, and of course, other types of chips may also be selected, which is not limited herein.
Based on the above embodiment, in this embodiment, in order to facilitate the switch to the corresponding circuit in real time when the upper cover of the device is opened, the bidirectional switch 10 is a spring normally open and normally closed bidirectional switch as a preferred embodiment.
Specifically, when the upper cover is pressed down, the normally-open normally-closed switch of the spring in the embodiment is automatically connected with a normally-closed contact of an external circuit through spring switching; when the device upper cover is opened, it is automatically switched to the normally open contact of the internal circuit by the spring.
In order to enable those skilled in the art to better understand the device disassembly prevention system provided by the invention, the invention is further described in detail below with reference to an electrical schematic diagram of the device disassembly prevention system provided by the embodiment of the invention.
Fig. 3-1 is an electrical schematic diagram of a first device tamper evident system according to an embodiment of the present invention, as shown in fig. 3-1.
When the upper cover of the device is depressed, the bidirectional switch 10 is connected with the normally closed contact of the 12V external power supply of the external power supply circuit 30 to constitute an external power supply circuit.
The specific connection circuit of the voltage dividing circuit 40 is as follows:
the voltage dividing circuit 40 specifically includes a voltage dividing resistor R1 and a voltage dividing resistor R2; one end of R1 is connected with a movable contact of the two-way switch, the other end of R1 is connected with one end of a divider resistor R2, and the other end of R2 is connected with the negative electrode of a 12V external power supply.
The voltage stabilizing circuit 60 specifically includes a first voltage stabilizing chip LM2596 and a second voltage stabilizing chip ASM 1117-3.3. The specific connection of the voltage stabilizing circuit 60 is as follows:
the 35-5V input interface of the LM2596 is connected with the movable contact of the two-way switch 10, the 5V output interface of the LM2596 is connected with the 5V input interface of the ASM 1117-3.3, and the GND interface of the LM2596 is connected with the negative electrode of the 12V external power supply; the 3.3V output interface of the ASM 1117-3.3 is connected with the VCC interface of the control chip MCU, and the GND interface of the ASM 1117-3.3 is connected with the negative pole of the 12V external power supply.
The detection circuit 50 is specifically an MCU control chip and an AT24C04 chip. The specific connection of the detection circuit 50 is as follows:
the AD1 interface of the MCU is connected with one end of a divider resistor R2, the VCC interface of the MCU is connected with a 3.3V output interface of an ASM 1117-3.3, the SCL and SDA interfaces of the MCU are correspondingly connected with the SCL and SDA interfaces of an AT24C04, and the GND interface of the MCU and the GND interface of the AT24C04 are both connected with the negative electrode of a 12V external power supply; the VCC interface of AT24C04 is connected with the 3.3V output interface of ASM 1117-3.3.
Wherein, after the AD1 interface of the MCU is connected with the voltage dividing resistor R2, the voltage dividing value of the AD1 interface of the MCU is thatAt this time, the MCU obtains a normal state flag bit of the uncapped equipment.
Fig. 3-2 is an electrical schematic diagram of a second type of tamper evident system according to an embodiment of the present invention, as shown in fig. 3-2.
When the upper cover of the device is opened, the bi-directional switch 10 is connected with the normally open contact of the 6V internal power supply of the internal power supply circuit 20 to form an internal power supply loop.
The specific connection circuit of the voltage dividing circuit 40 is as follows:
the voltage dividing circuit 40 specifically includes a voltage dividing resistor R1 and a voltage dividing resistor R2; one end of R1 is connected with the movable contact of the two-way switch, the other end of R1 is connected with one end of a divider resistor R2, and the other end of R2 is connected with the negative pole of a 6V internal power supply.
The voltage stabilizing circuit 60 specifically includes a first voltage stabilizing chip LM2596 and a second voltage stabilizing chip ASM 1117-3.3. The specific connection of the voltage stabilizing circuit 60 is as follows:
the 35-5V input interface of the LM2596 is connected with the movable contact of the bidirectional switch 10, the 5V output interface of the LM2596 is connected with the 5V input interface of the ASM 1117-3.3, and the GND interface of the LM2596 is connected with the negative electrode of the 6V internal power supply; the VCC interface of 3.3V output MCU of ASM 1117-3.3 is connected, and the GND interface of ASM 1117-3.3 is connected with 6V internal power supply's negative pole.
The detection circuit 50 is specifically an MCU control chip and an AT24C04 chip. The specific connection of the detection circuit 50 is as follows:
the AD1 interface of the MCU is connected with one end of a divider resistor R2, the VCC interface of the MCU is connected with a 3.3V output interface of an ASM 1117-3.3, the SCL and SDA interfaces of the MCU are correspondingly connected with the SCL and SDA interfaces of an AT24C04, and the GND interface of the MCU and the GND interface of the AT24C04 are both connected with the negative electrode of a 6V internal power supply; the VCC interface of AT24C04 is connected with the 3.3V output interface of ASM 1117-3.3.
Wherein, after the AD1 interface of the MCU is connected with the voltage dividing resistor R2, the voltage dividing value of the AD1 interface of the MCU is thatAt this time, the MCU obtains the abnormal state zone bit after the equipment is opened. And stores the abnormal state flag bit to the power down storage device AT24C04. When the main program is executed, after the abnormal state flag bit stored in the power-down storage device AT24C04 is detected, the device is automatically locked, and the functional information safety of the device is protected.
When the upper cover of the equipment is opened, the anti-disassembly system of the equipment is firstly connected to an internal power supply circuit inside the equipment through the two-way switch 10, and cuts off the external normal power supply circuit of the equipment; then, the voltage dividing circuit is communicated with an internal power supply circuit through a two-way switch 10, and the voltage dividing circuit generates an internal voltage dividing value; finally, after detecting the internal partial pressure value, the MCU judges that the equipment is disassembled, and stores the uncapped state flag bit into the AT24C04. And further executing the anti-disassembly function to lock the equipment function information. When the equipment is powered on again, the flag bit in the FLASH in the EEPROM or the MCU is still stored, so that the equipment can not be normally started for use once the equipment is disassembled and reassembled. Therefore, the equipment anti-disassembly system provided by the invention does not need to be designed into a complex mechanical structure, and only needs to protect the functional information of the equipment through the equipment anti-disassembly system in the equipment, so that the burden of designers and installers of the equipment anti-disassembly system is reduced. And secondly, after the equipment is opened, the equipment is automatically powered off, and the anti-dismantling function of the equipment anti-dismantling system can be realized without normal power-on, so that the equipment is locked to protect the function information of the equipment.
In addition, the system can be used for electric automobile charging piles, wireless charging transmitting and receiving devices and the like, and is not limited herein.
The above describes the anti-dismantling system of the device provided by the invention in detail. The principles and embodiments of the present invention have been described herein by way of several examples, the foregoing examples being provided to facilitate understanding of the method of the present invention and its core ideas; meanwhile, since modifications, substitutions and improvements of the present invention will be readily apparent to those of ordinary skill in the art, and it is intended that the present disclosure should not be construed as limited to the embodiments described, but rather should be construed as including modifications, equivalents, adaptations and improvements of the present invention without undue burden.
It should also be noted that in this specification relational terms such as first and second, and the like are used solely to distinguish one operation from another operation without necessarily requiring or implying any actual such relationship or order between such entities or operations. Moreover, the terms "comprises," "comprising," and the like, are intended to cover a list of elements in a unit, device, or system that includes only those elements but also other elements not expressly listed or inherent to such unit, device, or system.
Claims (9)
1. A system for preventing disassembly of a device, comprising:
a two-way switch arranged on the inner side of the upper cover of the equipment;
when the upper cover of the equipment is pressed down, the two-way switch connects the voltage dividing circuit to an external power supply circuit; when the upper cover of the equipment is opened, the two-way switch connects the voltage dividing circuit to an internal power supply circuit;
and the detection circuit is connected with the voltage dividing circuit and used for detecting the voltage dividing value of the voltage dividing circuit.
2. The equipment tamper evident system of claim 1, wherein,
a first end of an external power supply in the external power supply circuit is connected with a normally-closed contact of the two-way switch, and a second end of the external power supply is connected with a second end of the voltage dividing circuit;
and a first end of an internal power supply in the internal power supply circuit is connected with the normally open contact of the two-way switch, and a second end of the internal power supply is connected with a second end of the voltage dividing circuit.
3. The equipment tamper evident system of claim 2, wherein the voltage divider circuit comprises:
the first voltage dividing resistor and the second voltage dividing resistor;
the first end of the first voltage dividing resistor is connected with the movable contact of the two-way switch, and the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor; and the second end of the second voltage dividing resistor is connected with the second end of the external power supply and the second end of the internal power supply.
4. The equipment tamper evident system of claim 1, wherein the system further comprises:
one end of the voltage stabilizing circuit is connected with the movable contact of the two-way switch, and the other end of the voltage stabilizing circuit is connected with the detection circuit.
5. The tamper evident system of claim 4, wherein the voltage stabilizing circuit comprises:
the first voltage stabilizing chip is connected with the movable contact of the bidirectional switch and used for converting the voltage value of an external power supply or the voltage value of an internal power supply connected with the bidirectional switch into a first stable voltage value;
the second voltage stabilizing chip is connected with the first voltage stabilizing chip and is used for converting a first stable voltage value output by the first voltage stabilizing chip into a second stable voltage value, and the other end of the second voltage stabilizing chip is connected with the detection circuit.
6. The tamper evident system of claim 4, wherein the detection circuit comprises:
a control chip and a power-down storage device;
the first end of the control chip is connected with the second end of the first voltage dividing resistor, the second end of the control chip is connected with the voltage stabilizing circuit, and the third end of the control chip is connected with the power-down storage device.
7. The equipment tamper evident system of claim 6, further comprising:
and the IIC bus is used for communicating the control chip and the power-down storage device.
8. The system of any one of claims 1-7, wherein the bi-directional switch is a spring normally open and normally closed bi-directional switch.
9. The device tamper evident system of claim 7, wherein the powered down storage device is an EEPROM or FLASH internal to the control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710770896.5A CN107368759B (en) | 2017-08-31 | 2017-08-31 | Equipment anti-disassembly system |
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| CN201710770896.5A CN107368759B (en) | 2017-08-31 | 2017-08-31 | Equipment anti-disassembly system |
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| CN107368759B true CN107368759B (en) | 2023-07-18 |
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| CN110823277B (en) * | 2018-08-07 | 2021-12-17 | 中惠创智（深圳）无线供电技术有限公司 | Equipment anti-dismounting device and equipment with anti-dismounting function |
| CN114595489B (en) * | 2022-02-17 | 2024-04-30 | 天地融科技股份有限公司 | Anti-disassembly method and device |
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| CN205249179U (en) * | 2015-12-09 | 2016-05-18 | 深圳市海能达通信有限公司 | Equipment is prevented tearing open in encryption and light detection circuit thereof |
| WO2017101313A1 (en) * | 2015-12-14 | 2017-06-22 | 乐视控股（北京）有限公司 | Voltage stabilization circuit for power output |
| CN205545301U (en) * | 2016-01-22 | 2016-08-31 | 广州御银科技股份有限公司 | Key protective film piece |
| CN205540967U (en) * | 2016-01-29 | 2016-08-31 | 深圳市金溢科技股份有限公司 | On -vehicle unit and mobile unit |
| CN106685063A (en) * | 2016-11-22 | 2017-05-17 | 上海云衡科技有限公司 | Power switching circuit |
| CN207232967U (en) * | 2017-08-31 | 2018-04-13 | 中惠创智无线供电技术有限公司 | A kind of equipment detatching-proof system |
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| CN107368759A (en) | 2017-11-21 |
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