CN114296567B - Anti-disassembly circuit for KVM unidirectional switching device and operation method - Google Patents
Anti-disassembly circuit for KVM unidirectional switching device and operation method Download PDFInfo
- Publication number
- CN114296567B CN114296567B CN202111645645.7A CN202111645645A CN114296567B CN 114296567 B CN114296567 B CN 114296567B CN 202111645645 A CN202111645645 A CN 202111645645A CN 114296567 B CN114296567 B CN 114296567B
- Authority
- CN
- China
- Prior art keywords
- micro switch
- battery
- circuit
- switch
- kvm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000006870 function Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
Abstract
The invention provides an anti-disassembly circuit for a KVM unidirectional switching device and an operation method, wherein the anti-disassembly circuit comprises: micro-switches, microprocessors and rechargeable batteries; the pressure handle of the micro switch is contacted with the inner wall of the shell of the KVM unidirectional switching device, and the micro switch is in a normally open state at the moment; when the micro switch is separated from the inner wall of the shell, the micro switch is in a normally closed state; the positive electrode end of the battery is connected with the first end of the micro switch, the second end of the micro switch is connected with the input port of the microprocessor through the voltage dividing circuit, and the negative electrode end of the battery is connected with the input port of the microprocessor through the voltage dividing circuit; when the shell is disassembled, the handle-type micro switch is connected, the equipment is powered by a battery, the status indicator lights flash alternately, the functions of program self-destruction, mouse keyboard and display switching are invalid until the program is rewritten, and the data safety is improved.
Description
Technical Field
The invention relates to the technical field of equipment anti-disassembly control, in particular to an anti-disassembly circuit for a KVM unidirectional switching device and an operation method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
KVM (Keyboard Video Mouse) technology is widely applied, and information security of corresponding devices is an important point at present, and besides physical isolation in data transmission design, how to prevent devices from being disassembled to cause data loss is also important.
The traditional KVM device has the following processing methods for data secondary protection: the anti-disassembly mechanism is not involved, only the label is attached to the joint of the shell, the connection between the shell and the internal board card is relatively stable only through the structural design, the cover opening detection is carried out by using a special safety chip, the physical protection effect of the first three types of data is very little, and the last three types of data can be detected and processed correspondingly but have relatively high cost
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides an anti-disassembly circuit for a KVM unidirectional switching device and an operation method, when a shell is disassembled, a micro switch with a handle is connected, equipment is powered by a battery, a status indicator lamp alternately flashes, a program is self-destructed, functions such as a mouse keyboard and display switching are invalid until the program is re-programmed, and the data safety is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the first aspect of the present invention provides an anti-disassembly circuit for a KVM switch.
An anti-tamper circuit for a KVM unidirectional switching device, comprising: micro-switches, microprocessors and rechargeable batteries;
the pressure handle of the micro switch is contacted with the inner wall of the shell of the KVM unidirectional switching device, and the micro switch is in a normally open state at the moment; when the micro switch is separated from the inner wall of the shell, the micro switch is in a normally closed state;
the positive terminal of the battery is connected with the first terminal of the micro switch, the second terminal of the micro switch is connected with the input port of the microprocessor through the voltage dividing circuit, and the negative terminal of the battery is connected with the input port of the microprocessor through the voltage dividing circuit.
Further, the voltage dividing circuit comprises a first resistor, a second resistor and a third resistor, the second end of the micro switch is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the second end of the second resistor and the first end of the third resistor, the first end of the second resistor is connected with the negative electrode end of the battery, and the second end of the third resistor is connected with the input port of the microprocessor.
Further, the second end of the micro switch is connected with the positive electrode end of the first diode, and the negative electrode end of the first diode is connected with a power supply.
Further, the battery charging system further comprises a charging management circuit connected with the battery, and the charging management circuit is connected with the charging indicator lamp.
Further, a 502020P lithium battery is adopted as the battery.
Further, the charge management circuit includes a DIO5518B processor and peripheral circuitry.
Further, the microprocessor is connected with an alarm indicator lamp.
Further, the micro switch is a three-leg handle micro switch.
A second aspect of the present invention provides a method for operating the anti-disassembly circuit for the KVM unidirectional switching apparatus according to the first aspect, comprising the following steps:
judging whether the shell removing detection mark is correct or not, and if so, entering the next step;
judging whether the battery is powered or not, if so, judging that the equipment is disassembled, and executing the following steps:
the state is written into the flash memory for detecting the shell-removing state after the power is turned on again, executing a data self-destruction program, alarming an indicator lamp, locking a key mouse and keyboard operation, and closing a relay switch switching function.
Further, when the shell removing operation occurs, the micro switch is separated from the inner wall of the shell, the micro switch is in a normally closed state, the battery forms a loop through the micro switch and the voltage dividing circuit, the input port of the microprocessor monitors high level, and the battery is judged to be powered at the moment.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the anti-disassembly circuit and the operation method for the KVM unidirectional switching device, when the shell is disassembled, the handle-type micro switch is turned on, the device is powered by a battery, the status indicator lights alternately flash, the program is self-destroyed, and the functions of a mouse keyboard, display switching and the like are invalid until the program is re-programmed, so that the data safety is improved.
2. According to the anti-disassembly circuit and the operation method for the KVM unidirectional switching device, the adopted handle type micro switch is pressed when the equipment shell is installed, and the switch is in a normally open state; when the equipment shell is detached, the switch is sprung, the switch is in a normally closed state, and the battery power supply is started, so that the problem of reducing the power consumption of the equipment is fundamentally solved, and the cost is reduced when the design is simple.
3. The anti-disassembly circuit and the operation method for the KVM unidirectional switching device can perform data self-destruction. On the basis of unidirectional switching, data are secondarily protected, and the safety of system data is guaranteed in a self-destruction mode.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a block diagram of an anti-tamper circuit for a KVM unidirectional switching device according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of an anti-disassembly circuit according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a disassembly detection flow provided in embodiment 1 of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1:
as shown in fig. 1 and 2, embodiment 1 of the present invention provides an anti-disassembly circuit for a KVM unidirectional switching device, where the KVM device can operate two hosts to share a display through a set of keyboard and mouse, and simultaneously realize physical isolation of a data transmission channel between the two hosts, and the anti-disassembly circuit specifically includes two parts, which are respectively: the anti-disassembly closing module and the power supply mode detection module.
In the anti-disassembly closing module: the micro switch is welded to a circuit board, and is welded to a second part of main control board through two 1 x 2P pins with the distance of 2.54mm, and is mainly used as a battery-powered switch.
The power supply mode detection module: the module provides a lithium battery charging management circuit and a battery power supply detection interface. The lithium battery uses 502020P, and the charge management chip uses DIO5518B, and when the battery is charging, the pilot lamp is on, and when the battery charging is over, the pilot lamp goes out.
The third pin BAT of the DIO5518B chip is connected with the positive electrode of the battery, and the positive electrode of the battery is connected with the anti-disassembly related module. Under normal state, the switch is in a normally open state, when the switch is conducted (namely when the shell is removed), a loop can be formed, after R1 and R2 are divided, and after R3 is used for limiting current, the loop is input to the GPIO port of the MCU for judging the power supply mode. When the input is high, the device may be determined to be battery powered.
The embodiment adopts a unique handle-type micro-switch, and the conventional handle-type micro-switch is normally open before pressing, and is normally closed during pressing, but is not practical for the device. Therefore, the switch selected by the device is opposite to the conventional state, and after the equipment shell is installed, the switch is pressed and is in a normally open state; when the equipment shell is removed, the switch is sprung, and is in a normally closed state, and the battery power supply is started. The power supply circuit has the advantages that when the switch is pressed, the switch is opened, the power supply circuit does not work, and when the switch is sprung, the switch is closed, and the power supply circuit is restarted at the moment, so that the problem of reducing the power consumption of equipment is fundamentally solved. Not only is the design simple, but the cost is also reduced. If a conventional switch is used, the power supply circuit is always in a working state, and only a mode of reducing the power consumption of the power supply circuit can be selected, so that the design is complex, and the cost is increased.
Example 2:
the embodiment 2 of the invention provides an operation method of an anti-dismantling circuit for a KVM unidirectional switching device, which comprises the following steps:
a three-leg micro switch with a handle is used as an independent module and is connected with a main control board through an insert, the pressing handle of the micro switch is contacted with the inner side of the shell, and when the equipment is installed well, the pressing handle is pressed down, and the switch is in a normally open state. The switch then controls the level state of the lithium battery 502020P input to the MCU, which detects in real time whether the device is battery powered. Once the equipment shell is opened and is confirmed to be powered by a battery, the MCU executes a shell removing processing program, the control program carries out self-destruction and light alarm, and even if the equipment is powered on again, the equipment still cannot be used until the firmware is burned again.
The specific method is as shown in fig. 3, after the system is started, the program starts to detect whether the shell-removing detection mark is correct after the clock and the GPIO are initialized, if the correct mark is detected, whether the equipment is powered by a battery is judged, if the equipment is powered by the battery, the equipment is judged to be shell-removed, the state is written into FLASH first for detecting the shell-removing state after the equipment is powered on again, then the degree starts to self-destroy, the two host state indicator lamps alternately FLASH and alarm, the operation of a mouse is invalid, and the switching function of the relay switch is closed.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A prevent tearing open circuit for one-way auto-change over device of KVM, its characterized in that:
comprising the following steps: micro-switches, microprocessors and rechargeable batteries;
the pressure handle of the micro switch is contacted with the inner wall of the shell of the KVM unidirectional switching device, and the micro switch is in a normally open state at the moment; when the micro switch is separated from the inner wall of the shell, the micro switch is in a normally closed state;
the positive electrode end of the battery is connected with the first end of the micro switch, the second end of the micro switch is connected with the input port of the microprocessor through the voltage dividing circuit, and the negative electrode end of the battery is connected with the input port of the microprocessor through the voltage dividing circuit;
the voltage dividing circuit comprises a first resistor, a second resistor and a third resistor, the second end of the micro switch is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the second end of the second resistor and the first end of the third resistor, the first end of the second resistor is connected with the negative electrode end of the battery, and the second end of the third resistor is connected with the input port of the microprocessor;
the second end of the micro switch is connected with the positive electrode end of the first diode, and the negative electrode end of the first diode is connected with a power supply;
the anti-disassembly circuit further comprises a charging management circuit connected with the battery, and the charging management circuit is connected with the charging indicator lamp.
2. The tamper circuit for a KVM switch as recited in claim 1, wherein:
the battery adopts a 502020P lithium battery.
3. The tamper circuit for a KVM switch as recited in claim 1, wherein:
the charge management circuit includes DIO5518B processor and peripheral circuits.
4. The tamper circuit for a KVM switch as recited in claim 1, wherein:
the microprocessor is connected with the alarm indicator lamp.
5. The tamper circuit for a KVM switch as recited in claim 1, wherein:
the micro switch is a three-foot micro switch with a handle.
6. A method of operating the tamper resistant circuit for a KVM switch as claimed in any one of claims 1 to 5, comprising the steps of:
judging whether the shell removing detection mark is correct or not, and if so, entering the next step;
judging whether the battery is powered or not, if so, judging that the equipment is disassembled, and executing the following steps:
the state is written into the flash memory for detecting the shell-removing state after the power is turned on again, executing a data self-destruction program, alarming an indicator lamp, locking a key mouse and keyboard operation, and closing a relay switch switching function.
7. The method of operation of claim 6, wherein:
when the shell is detached, the micro switch is separated from the inner wall of the shell, the micro switch is in a normally closed state, the battery forms a loop through the micro switch and the voltage dividing circuit, the input port of the microprocessor monitors high level, and the battery is judged to be powered at the moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111645645.7A CN114296567B (en) | 2021-12-29 | 2021-12-29 | Anti-disassembly circuit for KVM unidirectional switching device and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111645645.7A CN114296567B (en) | 2021-12-29 | 2021-12-29 | Anti-disassembly circuit for KVM unidirectional switching device and operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114296567A CN114296567A (en) | 2022-04-08 |
| CN114296567B true CN114296567B (en) | 2023-12-22 |
Family
ID=80972173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111645645.7A Active CN114296567B (en) | 2021-12-29 | 2021-12-29 | Anti-disassembly circuit for KVM unidirectional switching device and operation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114296567B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116028999A (en) * | 2023-03-28 | 2023-04-28 | 成都万创科技股份有限公司 | Time-based anti-disassembly system and method for power gateway |
| CN116150820B (en) * | 2023-04-20 | 2023-11-24 | 粤港澳大湾区数字经济研究院(福田) | Aircraft management method based on confidential calculation coprocessor and aircraft |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202271385U (en) * | 2011-09-08 | 2012-06-13 | 宝元数控精密股份有限公司 | Handhold box quick release device for mechanical arm |
| CN104008611A (en) * | 2013-08-15 | 2014-08-27 | 曹松伟 | Self-service type small charging and switching equipment and information management system |
| CN107295731A (en) * | 2017-07-05 | 2017-10-24 | 深圳市必拓电子有限公司 | A kind of mobile emergency lamp and its Working mode switching method |
| CN206903424U (en) * | 2017-05-31 | 2018-01-19 | 北京摩拜科技有限公司 | A kind of dismantling-proof alarming lock and vehicle |
| CN207396744U (en) * | 2017-11-16 | 2018-05-22 | 南充驭云创新科技有限公司 | A kind of anti-dismounting device of unmanned plane locator based on microswitch |
| CN112446058A (en) * | 2020-12-16 | 2021-03-05 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Data safety protection device |
| CN112954135A (en) * | 2021-02-25 | 2021-06-11 | 北京航天长峰股份有限公司 | Audio-video signal one-way isolation transmission control device |
| CN213934894U (en) * | 2020-11-03 | 2021-08-10 | 中共中央办公厅机要交通局 | Anti-dismantling circuit |
| CN214279092U (en) * | 2021-02-25 | 2021-09-24 | 北京航天长峰股份有限公司 | Anti-dismantling alarm case |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USH2115H1 (en) * | 2002-06-11 | 2005-03-01 | Morning Pride Manufacturing, L.L.C. | Protective garment packed in sealed pouch wherein partial vacuum is drawn |
-
2021
- 2021-12-29 CN CN202111645645.7A patent/CN114296567B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202271385U (en) * | 2011-09-08 | 2012-06-13 | 宝元数控精密股份有限公司 | Handhold box quick release device for mechanical arm |
| CN104008611A (en) * | 2013-08-15 | 2014-08-27 | 曹松伟 | Self-service type small charging and switching equipment and information management system |
| CN206903424U (en) * | 2017-05-31 | 2018-01-19 | 北京摩拜科技有限公司 | A kind of dismantling-proof alarming lock and vehicle |
| CN107295731A (en) * | 2017-07-05 | 2017-10-24 | 深圳市必拓电子有限公司 | A kind of mobile emergency lamp and its Working mode switching method |
| CN207396744U (en) * | 2017-11-16 | 2018-05-22 | 南充驭云创新科技有限公司 | A kind of anti-dismounting device of unmanned plane locator based on microswitch |
| CN213934894U (en) * | 2020-11-03 | 2021-08-10 | 中共中央办公厅机要交通局 | Anti-dismantling circuit |
| CN112446058A (en) * | 2020-12-16 | 2021-03-05 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Data safety protection device |
| CN112954135A (en) * | 2021-02-25 | 2021-06-11 | 北京航天长峰股份有限公司 | Audio-video signal one-way isolation transmission control device |
| CN214279092U (en) * | 2021-02-25 | 2021-09-24 | 北京航天长峰股份有限公司 | Anti-dismantling alarm case |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114296567A (en) | 2022-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114296567B (en) | Anti-disassembly circuit for KVM unidirectional switching device and operation method | |
| CN100419699C (en) | Method and device remotely automatic recovering CMOS date with network | |
| KR920008442B1 (en) | Computer system with resume function | |
| CN102707790B (en) | Automatic switching device for laptop and control method thereof | |
| JP3974510B2 (en) | Computer apparatus, power management method, and program | |
| KR100272433B1 (en) | Electronic equipment and its power supply processing method | |
| CN105225316A (en) | A kind of dormancy of electron key low-power consumption power supply plan and awakening method | |
| WO2014121681A1 (en) | Method for card reader to communicate with upper computer | |
| CN103092315A (en) | Mobile terminal capable of recovering application program after restart | |
| CN103105915A (en) | Intelligent terminal reset method and intelligent terminal reset system | |
| CN102890662B (en) | By USB HID device is carried out the method that secondary enumerates to identify host operating system | |
| CN105739657A (en) | Circuit structure applied to embedded system | |
| CN111597520A (en) | Computer USB interface information security prevention and control method and system | |
| JP2870590B2 (en) | Information processing device with data protection mechanism | |
| JP2002140135A (en) | Notebook type computer system, and method of displaying battery capacity using led for same kind of system | |
| CN107471255A (en) | Power panel, robot for robot | |
| CN101826685B (en) | Power supply socket device special for computer | |
| CN103823768B (en) | Encrypted mobile hard disk cartridge with memory card copying function | |
| CN109688355A (en) | A kind of display screen discharge control device of OLED TV | |
| CN105824650A (en) | Computer system, adaptive dormancy control module and control method for same | |
| CN103699857B (en) | The anti-hacking device of electronic equipment and electronic equipment | |
| CN201674070U (en) | Energy-saving power supply flashboard device | |
| CN101826684B (en) | Power plugboard device and control method thereof | |
| CN106684478A (en) | Control method with communication instruction for controlling USB battery | |
| CN101826686B (en) | Remote control power extension unit device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |