CN213934894U - Anti-dismantling circuit - Google Patents
Anti-dismantling circuit Download PDFInfo
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- CN213934894U CN213934894U CN202022511927.5U CN202022511927U CN213934894U CN 213934894 U CN213934894 U CN 213934894U CN 202022511927 U CN202022511927 U CN 202022511927U CN 213934894 U CN213934894 U CN 213934894U
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Abstract
The utility model relates to a tamper circuit, it includes first power, second power, detection switch, alarm and alarm switch, one end of detection switch is connected with one end of first power, the other end of detection switch is connected with the control end of alarm switch, the alarm with connect in the second power supply circuit after the alarm switch is established ties; the detection switch is connected with the alarm switch when the shell is forcibly opened, and the alarm gives an alarm in response to the connection of the second power supply circuit. The utility model discloses report to the police when treating protection device's casing is illegally opened, and then protect the device.
Description
Technical Field
The utility model relates to an electronic circuit field relates to an anti-tear circuit very much.
Background
With the rapid development of social economy, information technologies such as the internet and computers rise and infiltrate into the aspects of society. Among them, many electronic products and control devices do not allow unauthorized operations by unrelated persons for safety reasons, and particularly do not allow the housings of the devices and products to be opened.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model provides a prevent tearing open circuit is applied to in electronic product or the controlgear, in order to prevent product or equipment are illegally torn open the machine.
In order to solve the technical problem, according to an aspect of the present invention, the present invention provides an anti-tamper circuit, which is installed in a housing of a device to be protected, wherein the anti-tamper circuit includes a first power supply, a second power supply, a detection switch, an alarm and an alarm switch, wherein one end of the detection switch is connected to one end of the first power supply, the other end of the detection switch is connected to a control end of the alarm switch, and the alarm is connected in series with the alarm switch and then connected to a power supply loop of the second power supply; the detection switch is connected with the alarm switch when the shell is forcibly opened, and the alarm gives an alarm in response to the connection of the second power supply circuit.
According to another aspect of the present invention, the present invention provides a tamper circuit, which is installed in a housing of a device to be protected, the tamper circuit includes a first power supply, a second power supply, a normally open detection switch, an alarm and a first triode, wherein a first end of the detection switch is connected to a first power supply end of the first power supply, and a second end of the detection switch is connected to a base of the first triode through a base resistance; a collector electrode of the first triode is connected with a first end of the alarm, and an emitter electrode of the first triode is connected with a second power supply end of the first power supply; the second end of the alarm is connected with the power supply end of the second power supply; when the shell is opened forcibly, the detection switch is closed, and the alarm gives an alarm.
The utility model provides a prevent tearing open circuit can report to the police when treating protection device by illegal operation, and then enable treat protection device stop work, thereby guaranteed the safety of treating protection device transmission data.
Drawings
Preferred embodiments of the present invention will be described in further detail below with reference to the attached drawings, wherein:
fig. 1 is a schematic diagram of a tamper-evident circuit according to an embodiment of the present invention;
fig. 2 is a schematic external view of an apparatus employing a tamper-evident circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a detection switch according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the positional relationship between the casing of the device to be protected and the hall switch according to an embodiment of the present invention;
fig. 5 is a schematic view of a housing seal arrangement of a device to be protected according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a detection switch circuit according to an embodiment of the present invention;
fig. 7 is a schematic view of a double-walled housing of a device to be protected according to an embodiment of the present invention; and
fig. 8 is a schematic view of a double-walled housing of a device to be protected according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.
Fig. 1 is a schematic diagram of a tamper circuit according to an embodiment of the present invention, the tamper circuit in this embodiment includes a first power source X20, a second power source 12V _ in, a detection switch X19, an alarm beep and an alarm switch, wherein a first end of the detection switch X19 is connected to an anode of the first power source X20, i.e. a power supply terminal, and a second end of the detection switch X19 is connected to a control terminal which is turned on by an alarm. The utility model discloses in, alarm switch is switch triode Q1, and the second end of detection switch X19 passes through the base resistance and connects the base at switch triode Q1, and the one end at alarm beep is connected to switch triode Q1's collecting electrode, and the other end of alarm beep is connected at second power 12V _ in, and switch triode Q1's projecting pole is connected at first power X20's negative pole. When the detection switch X19 detects that the housing is forcibly opened, the detection switch is closed, the first power supply X20 provides base current for the switching transistor Q1 to make the switching transistor Q1 conduct in saturation, and then the second power supply circuit where the alarm beep is located is switched on, and the alarm beep gives an alarm. In this embodiment, the first power source X20 is two batteries respectively providing 1.5V in series, and the second power source 12V _ in is an input power source of the device to be protected and provides 12V dc voltage. Of course, depending on the power supply parameters of the alarm, it is also possible to use the first power supply or a battery as the second power supply.
The utility model discloses send the warning when treating protection device's casing and being opened by force to the suggestion casing is being opened illegally at present.
In this embodiment, the alarm beep is a buzzer, and may also be an audible and visual alarm, or a detector that sends alarm information, and is connected to the relevant monitoring device. When the shell is forcibly opened, the detector sends out a high level representing alarm information, and after the monitoring device receives a high level signal sent by the detector, the shell of the device to be protected is determined to be forcibly opened, so that an alarm is given, or a power supply of the device is cut off.
The installation position of the alarm can be located in the device to be protected, and can also be installed in a place far away from the device to be protected, such as a monitoring room and the like, so that monitoring personnel can conveniently obtain alarm information immediately.
Further, in order to enable the device to be protected to immediately stop working when being illegally operated, the tamper-proof circuit further includes a device power protector F1 and a first power switch. The first power switch is a switching transistor Q2, the base of which is connected with the positive pole of the first power supply X20 through a detection switch X19, the collector of the switching transistor Q2 is connected with the second end of a power supply protector F1 in the power supply loop of the device, and the emitter of the switching transistor Q2 is connected with the negative pole of the first power supply X20. The power protector F1 may be any type of fuse, such as the socket type fuse shown in fig. 1. The first end of the power supply protector F1 is connected with a power supply of the device to be protected, and supplies power to the circuit of the device after passing through the power supply protector F1. The first terminal of the power protector F1 is also connected to the anode of the second power source X20 through a diode D1.
When the shell is illegally opened, the detection switch X19 is closed, the base of the switching triode Q2 is connected with the first power supply X20, the base current provided by the first power supply X20 enables the switching triode Q2 to enter a saturated state instantly, the collector and the emitter are conducted, and therefore the first power supply X20 and the power supply protector F1 form a closed circuit loop, and therefore the power supply protector F1 is fused due to the fact that excessive current flows instantly, and the power supply loop of a device to be protected is cut off.
Fig. 2 is an appearance schematic diagram of a to-be-protected device using the anti-tamper circuit of the present invention. The device to be protected is an audio and video physical isolation device and is used for physically isolating audio and video signals of different networks, so that the information of the respective networks is prevented from being leaked. In this embodiment, the device to be protected includes a housing 1, where the housing 1 includes a front panel and a rear panel, and various interfaces are provided on the panels for accessing audio and video signals. The inside of the shell 1 is a circuit of the device, various electrical components are installed on an electrical board, and the electrical board is fixed with a bottom plate of the shell.
The power interface of the device is connected with the power adapter, and the 220V commercial power is converted by the power adapter to provide 12V power supply for the device. The utility model provides a prevent tearing open circuit connection on near power source interface's circuit board, detection switch wherein installs in the casing junction. The utility model provides a detection switch that relates to is for example OMRON company's D3SH-BIRI model detection switch, and its schematic structure is shown in FIG. 3, and it is fixed in the casing suitable department through device structure 23, and two pins 22 are connected respectively in the circuit. When the casing is opened illegally, the operating lever 21 of the detection switch is pressed down to close the detection switch, thereby giving an alarm and opening the power supply circuit of the device.
The detection switch may be a travel switch or a microswitch, or may be a proximity switch or a hall switch. Fig. 4 is a schematic diagram showing the positional relationship between the housing and the hall switch. Wherein, treat that protection device's casing 11 and casing 12 are each other lock-joint together, treat protection device's circuit and the utility model provides a prevent tearing open circuit mount on circuit board 13, circuit board 13 is fixed inside casing 12. The hall switch X30 is fixed to the circuit board 13, and a magnet X31 is attached to the bottom end of a mounting bracket X32 provided on the housing 11. When the housing 11 is separated from the housing 12, the mounting bracket X32 moves along with the housing 11, and the magnet X31 thereon approaches the hall switch X30, so that the hall switch X30 is turned on.
The installation principle of the proximity switch is similar to that of the Hall switch, a stop block for switching on the proximity switch is fixed on the shell and moves together with the shell, and when the shell is opened, the stop block enters the response range of the proximity switch, so that the proximity switch is switched on.
Detection switch can also be the contact switch of relay to cooperate necessary sensor, can realize detection switch's effect equally.
The utility model also provides a prevent tearing open structure, should prevent tearing open the structure including the casing of treating protection device that has special construction to the circuit is prevented tearing open in the cooperation, can play the effect of reporting to the police when treating protection device's casing by illegal operation. As shown in fig. 5, the housing of the device to be protected is a sealing structure, and sealing strips 20 are connected between the housing 21 and the housing and between the housing and the interface 22, so as to ensure that the inside of the housing of the device to be protected is a sealed space. And removing oxygen in the sealed space and filling inert gas. Fig. 6 is a schematic diagram of a detection switch circuit in a circuit matched with the special shell structure. The detection switch circuit includes an oxygen sensor X40 and a detection switch control circuit provided in the sealed space. The detection switch control circuit comprises a single chip microcomputer X41, a switch triode X42 and a relay circuit, wherein the relay circuit comprises a relay coil X43 and a pair of normally open contacts X44. The signal end of the oxygen sensor X40 is connected with one of the input ends of the singlechip X41, one output end of the singlechip X41 is connected with the base electrode of the triode X42, the collector electrode of the triode X42 is connected with a power supply Vcc, the emitter electrode of the triode X42 is connected with one end of the relay coil X43, and the other end of the relay coil X43 is grounded. The normally open contact X44 is used as a detection switch, and as shown in fig. 1, a first end of the normally open contact X44 is connected to the positive electrode of the first power source X20, and a second end is connected to the base electrodes of the switching transistors Q1, Q2 through base resistors, respectively.
The oxygen sensor X40 is located in the sealed space and sends the sensed oxygen concentration value to the single chip microcomputer X41. The single chip microcomputer X41 is internally provided with an oxygen concentration threshold value, the oxygen concentration sensing value is compared with the threshold value, and when the oxygen concentration sensing value is larger than the threshold value, the single chip microcomputer X41 outputs a high level. Under normal conditions, the oxygen concentration in the sealed space is very low, the oxygen concentration sensing value is smaller than the threshold value, and the single chip microcomputer X41 does not output; when the shell is illegally opened, the sealed environment is damaged, external oxygen enters the shell, the sensing threshold of the oxygen concentration sensed by the oxygen sensor is larger than the threshold, the single chip microcomputer X41 outputs high level to enable the triode X42 to be in saturated conduction, so that the collector and the emitter of the triode X42 are connected, the relay coil X43 is connected with a power supply Vcc and electrified, the normally open contact X44 is triggered to be closed, the alarm is alarmed, and the power supply of the device to be protected is switched.
In another embodiment, the housing comprises a double-layer housing, as shown in fig. 7-8, the device to be protected comprises double- layer housings 31 and 32, the inner space of the device to be protected is divided into two spaces, and the housings 31 and 32 are sealed by a sealing strip 30, so that one of the spaces is a sealed space 310. In fig. 7, the housing 31 is internally provided with a sealed space 310, and the circuit board 33 is located in a space between the housing 31 and the housing 32. In fig. 8, the space between the housing 31 and the housing 32 is a sealed space 310, and the circuit board 33 has various electrical components 34 mounted thereon and is located in the inner space enclosed by the housing 31. The oxygen sensor is built in the sealed space 310, and the sealed space 310 is filled with inert gas, and the oxygen concentration of the inert gas is less than the preset concentration. When the shell is opened, outside air enters the sealed space 310, the oxygen concentration is increased and exceeds the sensing threshold, the single chip outputs high level to the detection switch, then the alarm is given, and the power supply of the device to be protected can be cut off, so that the device to be protected stops working.
Due to sealing and the like, the inert gas in the sealed space leaks to different degrees, so that the oxygen concentration in the space is increased, and misoperation is caused. To address this problem, in another embodiment, an oxygen scavenger may be disposed within the sealed space filled with an inert gas to maintain the oxygen content within the sealed space below a preset concentration. The oxygen scavenger can be an oxygen scavenger mainly made of an inorganic matrix, for example, reduced iron powder is put into a small bag and is put into a sealed space.
The utility model discloses a circuit is prevented tearing open by equipment in treating protection device's casing the device is reported to the police when being operated illegally, and can cut off the supply circuit of device makes treat protection device stop work to the safety of treating protection device transmission data has been guaranteed.
The above embodiments are provided only for the purpose of illustration, and are not intended to limit the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should also belong to the scope of the present invention.
Claims (20)
1. The utility model provides a prevent tearing open circuit installs in treating protection device's casing, its characterized in that, prevent tearing open circuit and include first power, second power, detection switch, alarm and alarm switch, the one end of first power is connected to the one end of detection switch, alarm switch's control end is connected to the other end of detection switch, the alarm with connect in second power supply loop after alarm switch establishes ties.
2. The tamper circuit of claim 1, further comprising a device power protector and a first power switch, wherein one end of the device power protector is connected to the power input of the device to be protected and the power input of the first power source, and the other end of the device power protector is connected in the first power supply loop through the first power switch.
3. The tamper circuit of claim 2, wherein the alarm switch and the first power switch are triode switch circuits.
4. The tamper circuit of claim 3, wherein the second power source is a power supply or a first power source or a battery of the device to be protected.
5. The tamper circuit of claim 1, wherein the first power source is a battery.
6. The tamper circuit of claim 1, wherein the alarm is a buzzer, an audible and visual alarm, or a detector for sending an alarm message.
7. The tamper circuit of claim 1 wherein the alarm is mounted remotely from the device to be protected.
8. The tamper circuit of claim 1, wherein the detection switch is a travel switch, a micro switch, a proximity switch or a hall switch with a normally open switch therein.
9. The tamper circuit of claim 1, further comprising an oxygen sensor and a detection switch control circuit, wherein the oxygen sensor is connected to a signal input terminal of the detection switch control circuit, and an output terminal of the detection switch control circuit is connected to the detection switch.
10. The tamper circuit of claim 9, wherein the detection switch control circuit comprises a single chip microcomputer, a triode circuit and a signal relay, and a signal input end of the single chip microcomputer is connected with the oxygen sensor; the output end of the single chip microcomputer is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the coil of the signal relay, and the pair of normally open contacts of the signal relay is used as the detection switch.
11. The tamper circuit of claim 9, wherein the inside of the case of the device to be protected is a sealed space filled with inert gas, the oxygen sensor is disposed in the sealed space, and the oxygen concentration in the sealed space is less than a preset value.
12. The tamper circuit of claim 9, wherein the housing of the device to be protected is a double-layered housing that divides the interior of the device to be protected into two spaces, one of which is a sealed space filled with an inert gas.
13. The tamper circuit of claim 11 or 12, wherein an oxygen scavenger is disposed within the sealed space filled with the inert gas.
14. An anti-disassembly circuit is arranged in a shell of a device to be protected and is characterized by comprising a first power supply, a second power supply, a normally-open detection switch, an alarm and a first triode, wherein the first end of the detection switch is connected to the first power supply end of the first power supply, and the second end of the detection switch is connected to the base electrode of the first triode through a base electrode resistor; a collector electrode of the first triode is connected with a first end of the alarm, and an emitter electrode of the first triode is connected with a second power supply end of the first power supply; and the second end of the alarm is connected with the power supply end of the second power supply.
15. The tamper circuit of claim 14, further comprising a device power protector and a second transistor, wherein a first end of the device power protector is connected to a power input of a device to be protected, and a second end of the device power protector is connected to a collector of the second transistor; the base electrode of the second triode is connected with the second end of the detection switch through a base resistor, and the emitting electrode of the second triode is connected to the second power supply end of the first power supply; and the first power supply end of the first power supply is connected with the first end of the device power supply protector through a diode.
16. The tamper circuit of claim 14, further comprising an oxygen sensor and a detection switch control circuit, wherein the oxygen sensor is connected to a signal input of the detection switch control circuit, and wherein an output of the detection switch control circuit controls the detection switch.
17. The tamper circuit of claim 16, wherein the detection switch control circuit comprises a single chip microcomputer, a third triode circuit and a signal relay, and an input end of the single chip microcomputer is connected with a signal output end of the oxygen sensor; the output end of the singlechip is connected with the base electrode of the third triode through a base electrode resistor, the emitting electrode of the third triode is connected with the coil of the signal relay, and the collector-emitter electrode of the third triode is connected with the power supply end of the first power supply; and a pair of normally open contacts of the signal relay is used as the detection switch.
18. The tamper circuit of claim 16, wherein the inside of the housing of the device to be protected is a sealed space filled with an inert gas, the oxygen sensor is disposed in the sealed space, and the oxygen concentration in the sealed space is less than a preset value.
19. The tamper circuit of claim 16, wherein the device to be protected comprises a double-layered housing dividing an interior of the device to be protected into two spaces, one of which is a sealed space filled with an inert gas.
20. The tamper circuit of claim 18 or 19, wherein an oxygen scavenger is disposed within the sealed space filled with the inert gas.
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CN202022511927.5U CN213934894U (en) | 2020-11-03 | 2020-11-03 | Anti-dismantling circuit |
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CN202022511927.5U CN213934894U (en) | 2020-11-03 | 2020-11-03 | Anti-dismantling circuit |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114296567A (en) * | 2021-12-29 | 2022-04-08 | 中孚信息股份有限公司 | Anti-dismantling circuit for KVM unidirectional switching device and operation method |
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2020
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114296567A (en) * | 2021-12-29 | 2022-04-08 | 中孚信息股份有限公司 | Anti-dismantling circuit for KVM unidirectional switching device and operation method |
CN114296567B (en) * | 2021-12-29 | 2023-12-22 | 中孚信息股份有限公司 | Anti-disassembly circuit for KVM unidirectional switching device and operation method |
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