CN103839014B - Self-destruction circuit of tablet personal computer storage device - Google Patents
Self-destruction circuit of tablet personal computer storage device Download PDFInfo
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- CN103839014B CN103839014B CN201410103170.2A CN201410103170A CN103839014B CN 103839014 B CN103839014 B CN 103839014B CN 201410103170 A CN201410103170 A CN 201410103170A CN 103839014 B CN103839014 B CN 103839014B
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- 230000000875 corresponding Effects 0.000 claims abstract description 8
- 210000001138 Tears Anatomy 0.000 claims description 7
- 230000000052 comparative effects Effects 0.000 claims description 2
- 238000006243 chemical reactions Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagrams Methods 0.000 description 5
- 210000004556 Brain Anatomy 0.000 description 4
- XRHGYUZYPHTUJZ-UHFFFAOYSA-N 4-chlorobenzoic acid Chemical compound 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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING; 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
- G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
Abstract
Description
Technical field
The present invention relates to a kind of self-destruction circuit is and in particular to a kind of panel computer storage device self-destruction circuit.
Background technology
With informationalized development, the range of panel computer has also obtained great popularization, people can by data with The formation of electronic document is stored in the storage device of panel computer, such as NAND Flash, Tf-Card etc..In order to prevent storing Data is stolen, and prior art can be protected to data by various software or hardware configuration, such as tears machine self-destruction circuit open, this is torn open The purpose of machine self-destruction circuit is to prevent from obtaining the data in storage device by way of disassembling storage device.In the market Tear open machine self-destruction circuit be mainly by programmable device control relay, bulky capacitor is charged and sparks export one big Transient energy reaches burns function to back-end circuit.However, this kind of self-destruction circuit needs the electric capacity of thousand of microfarads, with As a example the SIKOREL125 25v3000uf 3300uf of EPCOS (Siemens), the volume of this electric capacity is that (diameter * is high for 21x38mm Degree), its volume is larger, and price is high, not only increase cost and be not easy to circuit integrated it is clear that being not appropriate for being applied to flat board electricity The precision equipment that this small size of brain has high demands.
Content of the invention
For the deficiencies in the prior art, the present invention proposes a kind of panel computer storage device self-destruction circuit, it is possible to decrease set Standby cost and be easy to that circuit is integrated, can be widely applied to the precision equipment that this small size of panel computer has high demands.
In order to achieve the above object, the technical solution adopted in the present invention is as follows：
A kind of panel computer storage device self-destruction circuit, including detector unit, switch unit and damage unit；Described detection Unit, for detecting whether panel computer is illegally torn open machine, and generates and corresponding tears machine signal open；Described switch unit, it is electrical Connect to this detector unit, connect a DC source to described damage unit and to described damage for machine signal is torn open according to correspondence Ruining unit provides an input voltage；Described damage unit, it includes a booster circuit, and this booster circuit is electrically connected to this switching Unit, the input voltage for providing this switch unit is boosted to generate a damage voltage, and will be defeated for this damage voltage Go out to the signal pin of panel computer storage device.
Preferably, described booster circuit is the DC boosting modular converter of feedback-less.
Preferably, described DC boosting modular converter includes DC boost converter, the first diode, the 4th to the 9th electricity Appearance, the first to the second inductance and the 6th to the 9th resistance；Wherein, the voltage input end of this DC boost converter pass through this Two inductance connections to this switch unit outfan, also by the 4th electric capacity in parallel and the 5th capacity earth, also successively By the 6th resistance and the 6th capacity earth, defeated to the voltage of this DC boost converter also by this second inductance connection Go out end；The power control terminal of this DC boost converter is connected between the 6th resistance and the 6th electric capacity；This DC boosting The voltage output end of transducer connects to the anode of this first diode；The overvoltage protection end of this DC boost converter connect to The negative electrode of this first diode；The feedback input end of this DC boost converter passes through the 7th capacitance connection to this first diode Negative electrode, also pass sequentially through the 7th resistance, the 8th in parallel resistance and the 9th resistance eutral grounding；The moon of this first diode Pole the 8th electric capacity in parallel and the 9th capacity earth.
Preferably, described damage unit also includes a comparison circuit and an electronic switching circuit；Described comparison circuit is electrical Connect to booster circuit, for being compared the threshold value prestoring in described damage voltage and comparison circuit, and according to comparing knot Fruit exports corresponding drive signal；Described electronic switching circuit includes an input, an outfan and a described driving of reception The control end of signal, this electronic switching circuit is used for correspondingly being turned on or off under the control of this drive signal, this electronic cutting The input closing circuit connects to the outfan of booster circuit, and the outfan of this electronic switching circuit connects to panel computer storage The signal pin of equipment.
Preferably, described damage unit also includes an anti-back flow circuit, and this anti-back flow circuit is electrically connected at electrical switch Between circuit and flat board computer storage equipment；The outfan of described switch unit is connected to liter piezoelectricity by one first filter circuit The input on road；The input of described electronic switching circuit is connected to the outfan of booster circuit by one second filter circuit.
Preferably, described damage unit also includes pwm control circuit and electronic switching circuit；Described pwm control circuit electricity Property connect to this booster circuit, for exporting periodic drive control signal, described electronic switching circuit be used in this drive Correspondingly it is turned on or off under the control of dynamic control signal；Described electronic switching circuit include an input, an outfan and The control end of the one described drive control signal of reception, the input of this electronic switching circuit connects to the outfan of booster circuit, The outfan of this electronic switching circuit connects to the signal pin of panel computer storage device.
Preferably, described pwm control circuit include the first pwm pulse generator, the second pwm pulse generator, the four or three Level pipe, the second diode, the tenth electric capacity and the 12nd to the 16th resistance；Wherein, the output of this first pwm pulse generator End connects the input of this second pwm pulse generator, and the outfan of this first pwm pulse generator passes sequentially through the 16th Resistance and the 15th resistance connect the input of this first pwm pulse generator；The outfan of this second pwm pulse generator By the tenth capacitance connection between the 16th resistance and the 15th resistance；The base stage of the 4th triode passes through the tenth Four resistance connect between this first pwm pulse generator and this second pwm pulse generator, the emitter stage of the 4th triode Ground connection, the colelctor electrode of the 4th triode connects the negative electrode of this second diode；The anode of this second diode passes sequentially through this 13rd resistance and the 12nd resistance connect to the outfan of booster circuit；Between 13rd resistance and the 12nd resistance Node connect to the control end of this electronic switching circuit.
Preferably, described detector unit includes the first signals collecting line, the first audion, the first electric capacity and first to Five resistance；Wherein, the signal output part of this first signals collecting line pass sequentially through this first resistor and this second resistance connect to Described DC source, also by this first capacitance connection between this first resistor and this second resistance, and this first signal is adopted The signal output part ground connection of line concentration；The base stage of this first audion by this 3rd resistor connect to this first resistor and this second Between resistance, the colelctor electrode of this first audion is connected to described DC source by the 5th resistance, also by the 4th electricity Resistance connects to described switch unit；The grounded emitter of this first audion.
Preferably, described testing circuit also includes secondary signal gathering line, the signal output part of this secondary signal gathering line Connect to this resistance and this second resistance.
Preferably, the internal battery that described DC source carries for panel computer.
Compared with prior art, the present invention is when panel computer is detected and illegally being torn open machine, can will be straight by switch unit Stream power supply connects to damage unit and provides an input voltage to damage unit, through damaging the booster circuit of unit by above-mentioned input The damage voltage of a high-voltage great-current, and the letter by this damage voltage output to panel computer storage device is generated after boost in voltage Number pin (as the RE pin of NAND Flash, the clock pins of Tf-Card), to puncture storage device, realizes to panel computer The damage of storage device.The invention has the advantages that：
1st, the present invention, when panel computer is detected and illegally being torn open machine, directly adopts a booster circuit that DC source is provided Input voltage carry out boosting process, to obtain the damage voltage of a high-voltage great-current, with prior art in pass through programmable device Control relay is charged to bulky capacitor and sparks comparing to obtain a big transient energy, and it can avoid bulky capacitor Use, thus reducing equipment cost and being easy to that circuit is integrated, can be widely applied to what this small size of panel computer had high demands Precision equipment.
2nd, the present invention is just connected DC source to damage by switch unit detecting when panel computer is illegally torn open machine Ruin unit and provide an input voltage to damage unit, compared with prior art, its stand-by power consumption is very little it is only necessary to 10uA is left Right.
3rd, the present invention adopt a feedback-less DC boosting modular converter as booster circuit, can rapidly obtain one high The damage voltage of pressure high current, and fully puncture panel computer storage device.
4th, the present invention realizes to the control damaging voltage value also by comparison circuit and electronic switching circuit, by default Threshold values can ensure that the damage voltage exporting to panel computer storage device reaches threshold values, to improve the reliability of damage.
5th, the internal battery that the DC source of the present invention carries for panel computer, and the self-destruction circuit on market is required for volume One battery of outer carry could work.
Brief description
Fig. 1 is the circuit block diagram of the preferred embodiment of panel computer storage device self-destruction circuit of the present invention；
Fig. 2 is the circuit diagram of detector unit in Fig. 1；
Fig. 3 is the circuit diagram of switch unit in Fig. 1；
Fig. 4 is the circuit diagram damaging unit in Fig. 1；
Fig. 5 is second embodiment of panel computer storage device self-destruction circuit of the present invention；
Fig. 6 is the circuit diagram damaging unit in Fig. 5.
Specific embodiment
Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further, in order to clearer understanding Present invention technological thought required for protection.
In the specific descriptions of following preferred embodiment, by the accompanying drawing with reference to appended by a composition present invention part.Institute Attached accompanying drawing has been illustrated by way of example and has been capable of specific embodiment, and the embodiment of example is not intended as Limit is according to all embodiments of the present invention.It is appreciated that without departing from the scope of the present invention, it is possible to use other Embodiment is it is also possible to carry out structural or logicality modification.Therefore, specific descriptions below nonrestrictive, and this The scope of invention is defined by the claims appended hereto.
Refer to Fig. 1, the present invention relates to a kind of panel computer storage device self-destruction circuit, its better embodiment includes examining Survey unit 100, switch unit 200 and damage unit 300.
Detector unit 100 is used for detecting whether panel computer is illegally torn open machine, and generates and corresponding tear machine signal open.Flat board electricity The casing of brain includes a face-piece and back cover, when this face-piece is disassembled thus during away from back cover, this detector unit 100 corresponds to generation one Tear machine signal open, and this is torn open machine signal and send to this switch unit 200.In this regard, detector unit 100 can also select prior art Present in multiple generating modes tearing machine signal open, such as pass through setting microswitch, photosensitive switch etc. inside face-piece, also can lead to Excess pressure induction installation.
In the present embodiment, detector unit 100 includes the first signals collecting line (not shown), secondary signal gathering line (not shown), audion Q1, electric capacity C1 and resistance R1 are to resistance R5.The signal output part of the first signals collecting line (TEST1PI, TEST1NI) passes sequentially through this resistance R1 and this resistance R2 and connects to a DC source VBAT, also by this electric capacity C1 connects between this resistance R1 and this resistance R2, and the signal output part (TEST1PI, TEST1NI) of this signals collecting line connects Ground.The signal output part (TEST1P2, TEST1N2) of this secondary signal gathering line connects between this resistance R1 and this resistance R2. The base stage of this audion Q1 connects the signal output part (TEST1P2, TEST1N2) of this secondary signal gathering line by resistance R3； The colelctor electrode of this audion Q1 is connected to this DC source VBAT by this resistance R5, connects to this switching also by this resistance R4 Unit 200, and this tears machine signal EN_KILL open to switch unit 200 output；The grounded emitter of this audion Q1.
This first signals collecting line is arranged in a broken string box, and the two ends soldering of this first signals collecting line is in flat board electricity On the PCBA of brain, under normal circumstances, this first signals collecting line is in "on" position.This broken string box is positioned on PCBA, and face Inside shell, a buckle is provided with to the position of the box that should break, when face-piece is disassembled, this buckle closely clasps this broken string box simultaneously It is driven to move to the direction away from back cover, thus pulling apart the first signals collecting line being arranged in this broken string box.The present embodiment In, in order to avoid the problem of getting stuck occurring it is ensured that to the accuracy illegally tearing machine testing open and susceptiveness, the present embodiment be configured with this Binary signal gathering line, it is the same with the first signals collecting line, is also arranged in this broken string box, and the two of this secondary signal gathering line On the PCBA of panel computer, under normal circumstances, this secondary signal gathering line is in "on" position for end soldering；When face-piece is disassembled When, this secondary signal gathering line is torn.It is also possible to cancel this secondary signal gathering line in some other embodiment.
Below the present embodiment detector unit 100 operation principle is illustrated：Under normal circumstances, this first signals collecting Line and secondary signal gathering line are in "on" position, now audion Q1 conducting, and the colelctor electrode of audion Q1 passes through resistance R5 Draw high to high level with DC source VBAT, and generate the high level tearing machine signal EN_KILL open；When face-piece is disassembled, first It is torn in signals collecting line and/or secondary signal gathering line, now audion Q1 cut-off, the colelctor electrode of audion Q1 is drawn Low, and start to export the low level tearing machine signal EN_KILL open.Wherein, resistance R1 and electric capacity C1 constitutes and prevents gushing circuit.
Switch unit 200 is electrically connected to this detector unit 100, for tearing machine signal open by above-mentioned DC source according to correspondence VBAT connects to this damage unit 300 and provides an input voltage KILL_VDD to this damage unit 300.Switch unit 200 To the effect of electrical switch, it can be using as the field effect transistor in this enforcement and/or electronic switch chip A04409.The present invention Just by this switch unit 200, DC source VBAT is connected to damage unit when panel computer is illegally torn open machine detecting 300 and to damage unit 300 provide this input voltage KILL_VDD, compared with prior art, its stand-by power consumption very little it is only necessary to Want 10uA.
Damage unit 300 includes the first filter circuit 310, booster circuit 320, the second filter circuit 330, comparison circuit 340th, electronic switching circuit 350 and anti-back flow circuit 360.
Wherein, this first filter circuit 310, booster circuit 320 and the second filter circuit 330 are electrically connected with successively, switching Unit 200 provide this input voltage KILL_VDD pass sequentially through this first filter circuit 310 filter, 320 liters of this booster circuit Pressure is filtered by this second filter circuit 330 after generating a damage voltage again.This comparison circuit 340 is electrically connected to boosting Circuit 320, for being compared the threshold value prestoring in above-mentioned damage voltage and comparison circuit, and exports phase according to comparative result The drive signal answered.This electronic switching circuit 350 includes the control of an input, an outfan and this drive signal of reception End, this electronic switching circuit 350 is used for correspondingly being turned on or off under the control of this drive signal, this electronic switching circuit 350 input connects to the outfan of booster circuit 320, and the outfan of this electronic switching circuit 350 passes through this reverse-filling electricity Road 360 connects to the signal pin of panel computer storage device (such as the RE pin of NAND Flash, the clock pipe of Tf-Card Foot).The present invention passes through comparison circuit 340 and electronic switching circuit 350 is realized to the control damaging voltage value, by presetting valve Value can ensure that the damage voltage exporting to panel computer storage device reaches threshold values, to improve the reliability of damage.
In the present embodiment, booster circuit 320 is the DC boosting modular converter of feedback-less, this DC boosting modular converter Including DC boost converter U1, diode D1, electric capacity C6 to electric capacity C9, inductance L2 and resistance R6 to resistance R9.Wherein, should The voltage input end VIN of DC boost converter U1 connects to the outfan of this switch unit 200, also passes sequentially through this resistance R6 It is grounded with the 6th electric capacity C6, connect also by this inductance L2 to the voltage output end SW of this DC boost converter.This direct current The power control terminal SHDN of boost converter U1 is connected between this this resistance R6 and the 6th electric capacity C6.This DC boosting is changed The voltage output end SW of device U1 connects to the anode of diode D1.The overvoltage protection end OVP of this DC boost converter U1 connects Negative electrode to this diode D1.The feedback input end FB of this DC boost converter U1 is connected to this two grades by the 7th electric capacity C7 The negative electrode of pipe D1, also passes sequentially through this resistance R7, this resistance R8 in parallel and this resistance R9 ground connection.The negative electrode of this diode D1 leads to This electric capacity C87 and this electric capacity C9 that cross parallel connection are grounded, and the negative electrode of this diode D1 is the outfan of booster circuit 320.
The chip model that DC boost converter U1 adopts is SY7200, and the DC boosting modular converter of the present invention can directly The feedback input end FB of stream boost converter U1 directly passes sequentially through this resistance R7, this resistance R8 in parallel and this resistance R9 connects Ground, forms a voltage increase and current constant circuit of feedback-less, thus the damage voltage of a high-voltage great-current can rapidly be obtained, and fills Divide and puncture panel computer storage device.
Preferably, this comparison circuit 340 is a comparison circuit being made up of voltage-reference, those skilled in the art's root A circuit with comparing function of the present invention can be built according to prior art by chip TL431.This electronic switching circuit 350 For a field effect transistor, the control end of this electronic switching circuit 350, input and outfan correspond to this field effect transistor grid, Source electrode and drain electrode.Preferably, this anti-back flow circuit 360 is diode.
In the present embodiment, the internal battery that DC source VBAT carries for panel computer, and the self-destruction circuit on market It is required for one battery of extra carry could work.
In other embodiments, damage unit may also be employed other implementations, as shown in figure 5, electric for flat board of the present invention Second embodiment of brain storage device self-destruction circuit, its difference from above-mentioned embodiment essentially consists in, by pre-stored threshold values Comparison circuit replace with a pwm control circuit, specifically, in second embodiment, damage unit include the first filtering Circuit 310 ', booster circuit 320 ', pwm control circuit 330 ' and electronic switching circuit 340 '.
This first filter circuit 310 ' outfan connects the input of this booster circuit 320 ', and switch unit 200 provides This input voltage KILL_VDD is delivered to booster circuit 320 ' after passing sequentially through the filtering of this first filter circuit 310 ' and is boosted, And correspond to generation one damage voltage on the storage capacitor C11 in this booster circuit 320 '.
This pwm control circuit 330 ' is electrically connected to booster circuit 320, for exporting periodic drive control signal. This electronic switching circuit 340 ' is used for correspondingly being turned on or off under the control of this drive control signal；This electronic switching circuit 340 ' the control ends including an input, an outfan and an above-mentioned drive control signal of reception, this electronic switching circuit Input connects to the outfan of booster circuit, and the outfan of this electronic switching circuit connects to the letter of panel computer storage device Number pin (as the RE pin of NAND Flash, the clock pins of Tf-Card).In the present embodiment, electronic switching circuit 340 ' Periodically turn in the drive control signal of pwm control circuit 330 ' and disconnect, when electronic switching circuit 340 ' turns on, Booster circuit 320 ' is delivered to damaging voltage to the signal pin of panel computer storage device (the RE pipe as NAND Flash Foot, the clock pins of Tf-Card), when electronic switching circuit 340 ' disconnects, booster circuit 320 ' stops the defeated of damage voltage Send, now storage capacitor C11 in booster circuit continue to charge (for example pass through booster circuit can on this storage capacitor C11 shape Become the damage voltage of 29V), therefore, can be for constantly storing to panel computer in the continuous charge and discharge process of storage capacitor C11 Equipment carries out damage provides power.
More specifically, this pwm control circuit 330 ' includes pwm pulse generator U2, pwm pulse generator U3, triode Q4, diode D2, electric capacity C10 and resistance R12 are to resistance R16.Wherein, the outfan of this pwm pulse generator U2 connects and is somebody's turn to do The input of pwm pulse generator U3, the outfan of this pwm pulse generator U2 passes sequentially through this resistance R16 and this resistance R15 Connect the input of this pwm pulse generator U2；The outfan of this pwm pulse generator U3 is connected to this by this electric capacity C10 Between resistance R16 and this resistance R15；The base stage of this triode Q4 connected to this pwm pulse generator U2 by this resistance R14 and Between this pwm pulse generator U3, the grounded emitter of this triode Q4, the colelctor electrode of this triode Q4 connects this diode D2 Negative electrode；The anode of this diode D2 passes sequentially through this resistance R13 and this resistance R12 and connects to the output of booster circuit 320 ' End；Node between this resistance R13 and this resistance R12 connects to the control end of this electronic switching circuit 340 ', drives for output Dynamic control signal.
Above-mentioned pwm pulse generator U2, pwm pulse generator U3, resistance R16, resistance R15 and the common structure of electric capacity C10 Become a square-wave generator with some cycles (if the cycle is 480ms), periodically to export low and high level signal, when it is defeated When going out the high level for square wave, triode Q4 turns on, and then promotes electronic switching circuit 340 ' to turn on, when it is output as square wave During low level, triode Q4 ends, and promotes electronic switching circuit 340 ' to disconnect.
This electronic switching circuit 340 ' is a field effect transistor, the control end of this electronic switching circuit 350, input and output End corresponds to grid, source electrode and the drain electrode of this field effect transistor.Preferably, this anti-back flow circuit 360 is diode.Pwm pulse The chip model of generator U2 and pwm pulse generator U3 is U307.
For a person skilled in the art, can technical scheme as described above and design, make other each Plant corresponding change and deform, and all these changes and deforms the protection model that all should belong to the claims in the present invention Within enclosing.
Claims (10)
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| CN201410103170.2A CN103839014B (en) | 2014-03-19 | 2014-03-19 | Self-destruction circuit of tablet personal computer storage device |
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| CN201410103170.2A CN103839014B (en) | 2014-03-19 | 2014-03-19 | Self-destruction circuit of tablet personal computer storage device |
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| CN103839014B true CN103839014B (en) | 2017-02-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104123513A (en) * | 2014-07-29 | 2014-10-29 | 中国航空无线电电子研究所 | Machine-mounted high-speed large-capacity data storage system with self-destruction function and self-destruction method |
| CN104331675A (en) * | 2014-10-27 | 2015-02-04 | 北京同方时讯电子股份有限公司 | Self-destruction device of electronic equipment |
| CN104317362A (en) * | 2014-10-27 | 2015-01-28 | 北京同方时讯电子股份有限公司 | Tablet personal computer with high data security |
| CN104361904B (en) * | 2014-11-06 | 2017-02-22 | 广东省电子信息产业集团有限公司 | Destroying device of nonvolatile storage |
| CN104820810A (en) * | 2015-03-10 | 2015-08-05 | 深圳市前海安测信息技术有限公司 | Board card anti-disassembly apparatus and method |
| CN104820809A (en) * | 2015-03-10 | 2015-08-05 | 深圳市前海安测信息技术有限公司 | Complete machine product anti-disassembling apparatus and method |
| CN104850805B (en) * | 2015-05-29 | 2019-03-26 | 北京华大信安科技有限公司 | A kind of device and method for protecting chip system sensitive information |
| CN105657169B (en) * | 2016-01-05 | 2019-02-19 | Oppo广东移动通信有限公司 | A kind of data guard method, device and mobile terminal |
| CN105718821A (en) * | 2016-01-15 | 2016-06-29 | 广东欧珀移动通信有限公司 | Terminal and data protection apparatus and method therefor |
| CN106991341B (en) * | 2016-09-08 | 2020-04-24 | 宜鼎国际股份有限公司 | Flash memory device with entity destroying function |
| CN107657183B (en) * | 2017-08-31 | 2020-03-27 | 中国人民解放军海军医学研究所 | Data security protection method and device for electronic equipment |
| CN109526179B (en) * | 2018-12-24 | 2021-01-05 | 出门问问信息科技有限公司 | Detection device and detection method for detecting disassembly of electronic equipment and electronic equipment |
| CN111046442B (en) * | 2019-12-11 | 2020-09-11 | 上海载德信息科技股份有限公司 | Self-destruction circuit of storage component of equipment and equipment with storage function |
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