CN104539283B - Working condition classified Monitoring circuit - Google Patents
Working condition classified Monitoring circuit Download PDFInfo
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- CN104539283B CN104539283B CN201410829226.2A CN201410829226A CN104539283B CN 104539283 B CN104539283 B CN 104539283B CN 201410829226 A CN201410829226 A CN 201410829226A CN 104539283 B CN104539283 B CN 104539283B
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Abstract
The present invention provides a kind of working condition classified Monitoring circuit, belongs to field of information security technology.Working condition classified Monitoring circuit includes multistage operating status monitoring sub-circuit, includes per one-level：Comparator, level translator and isolator, the quiescent point voltage that the comparator is used to compare the first stage amplifier in white noise acoustic amplifier in Tempest device is with threshold values to judge whether this grade of amplifier operation be normal, level translator is used to provide threshold voltage, and comparative result is converted into high level or low level；Isolator is used to isolate level translator.The present invention is judged by quiescent potential classification of the working condition split pole observation circuit to the circuit in Tempest device, sees its DC static operating point whether in normal voltage range, so as to judge whether the work of Tempest device is normal.Simple in construction, small volume of the invention, it can effectively judge the working condition of Tempest device.
Description
Technical field
The present invention relates to a kind of working condition classified Monitoring circuit, more particularly to one kind to be used to monitor Tempest device
In every stage circuit working condition observation circuit, belong to field of information security technology.
Background technology
With the high speed development of social informatization, electronic message unit also constantly improves, so as to meet the daily life of people
The needs that information interconnects in work.But electronic message unit will produce certain electromagnetic radiation while information exchanges, from
And cause two kinds of results：The leakage interfered with installation electromagnetical information of electromagnetic wave, wherein electromagnetic wave interfere problem
The problem of being people's extensive concern, the time that it is found is more early, and electromagnetic compatibility (EMC) technology is exactly to solve electromagnetic wave
Interfere problem and caused, there now have been the theory and technical foundation of comparative maturity.The problem of electromagnetic information leakage
Just be taken seriously and pay close attention in recent decades, with electromagnetic wave interfere problem compared with, electromagnetic information leakage treatment technology
Information security field is more focused on, its security work to information causes serious threat.
Although electromagnetic information leakage protect and detection technique and electromagnetic compatibility technology be all using the radiation problem of electromagnetic wave as
Basis, but difference be present with general electromagnetic compatibility technology again in it.Electromagnetic information leakage protection is with detection technique compared with general
Electromagnetic compatibility problem, it is more focused on leakage of information caused by the weak electromagnetic wave radiation of electronic information technology equipment, and
In general electromagnetic compatibility problem focuses on the microwave radiation at work of electronic equipment and other electronic equipments is done
Disturb, it is indifferent to the information entrained by electromagnetic wave.In addition, processing electromagnetic information leakage protection is asked with test problems than electromagnetic compatibility
Topic more requires detection and the test equipment of specialty.Also, electromagnetic information leakage protects will follow TEMPEST marks with detection
It is accurate.In a word, electromagnetic information leakage protection is with detection technique compared with the electromagnetic interference problem of electronic equipment, and its technical requirements are more
Height, electromagnetic environment is more complicated, testing standard is stricter.
With the continuous development of internet, computer has become a part indispensable in people's life.But count
For calculation machine as a kind of information processing and the equipment exchanged, it can constantly radiate a large amount of electromagnetic wave signals when working into space.
This electromagnetic wave signal given off is possible to carry the important information that computer is being handled, so as to give information security issue band
Carry out huge hidden danger.At work, its mainboard, display and all kinds of interface data wires, cable etc. can all be sent out computer
Project the different degrees of electromagnetic radiation of intensity.The angle theoretical from electromagnetic radiation, these useful informations given off all may be used
It can be received and be reduced.
For relating computer, its same radiated electromagnetic wave at work, and security information therein be possible to by
Receive so as to decode, the leakage of this mode, bypassed computer fire wall and hardware isolated including it is a series of anti-
Shield measure.In this case, even if computer is not connected the data that can similarly be stolen with any other equipment, so not having
It is difficult to block passage of divulging a secret to have the computer by special electromagnetic information safety and Protection to be.In general, computer
Primary radiation source concentrate on cable part, if its cable can not provide effective shielding or filtering, the spoke of its electromagnetic leakage
Penetrating intensity will greatly enhance.
The content of the invention
To overcome shortcoming present in prior art, goal of the invention of the invention is to provide a kind of working condition classified Monitoring
Circuit, it can effectively monitor the working condition of Tempest device, and then effectively prevent power supply beta radiation and conduction institute
Caused leakage of information.
To realize the goal of the invention, the present invention provides a kind of working condition classified Monitoring circuit, it is characterised in that including
Multistage operating status monitoring sub-circuit, include per one-level：Comparator, level translator and isolator, the comparator be used for than
Compared with quiescent point voltage and the threshold values of the first stage amplifier in the white noise acoustic amplifier in Tempest device to judge this
Whether level amplifier operation normal, and level translator is used to provide threshold voltage, and by comparative result be converted to high level or
Low level；Isolator is used to isolate level translator.
Preferably, the white noise amplifying circuit comprises at least two-stage.
Preferably, the multistage operating status monitoring sub-circuit comprises at least two-stage.
Compared with prior art, working state monitoring circuit provided by the invention can effectively monitor Tempest dress
The working condition put, and then effectively prevent power supply beta radiation and conduct caused leakage of information.
Brief description of the drawings
Fig. 1 provides the composition frame chart of Tempest device for the present invention；
Fig. 2 is the circuit diagram of noise generating device provided by the invention；
Fig. 3 is the composition frame chart of work condition indicator provided by the invention；
Fig. 4 is the circuit diagram of white noise acoustic amplifier provided by the invention；
Fig. 5 is the circuit diagram of working condition classified Monitoring sub-circuit provided by the invention；
Fig. 6 is the circuit diagram of low pass filter provided by the invention.
Embodiment
The invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 provides the composition frame chart of Tempest device for the present invention.As shown in figure 1, anti-information provided by the invention
Leakage device, including power-supply filter, AC/DC converters, noise-producing equipment, amplifier, low pass filter and working condition
Monitoring and display device, the power-supply filter are used to filter out power line carrier wave information on power line, it is preferable that power-supply filter
Stopband operating frequency range be 150KHz to 400MHz；AC/DC converters are used for from the taking-up AC power on power line simultaneously
Dc source, main generation+5V and+7V dc sources are converted into, is follow-up noise-producing equipment, amplifier, work shape
State provides dc source with display device.The noise-producing equipment is used to produce white noise；The amplifier is made an uproar for amplification
White noise acoustic intelligence produced by generating device；The white noise acoustic intelligence that the low pass filter is used to amplify amplifier is filtered
Ripple, it is preferable that the passband operating frequency range of low pass filter is 0MHz to 300MHz；The white noise is coupled by coupler
Onto power line, the coupler is inductive coupler or capacity coupler.
Fig. 2 is the circuit diagram of noise generating device provided by the invention.As shown in Fig. 2 noise provided by the invention produces
Device includes low pass filter and white noise generator, and the low pass filter is by inductance L5, electric capacity C9, electric capacity C15 and electric capacity
C16 is formed, and the cathode output end of+7V direct current supply lines connects the first end of the inductance L5, and inductance L5 the second end is all connected with
Electric capacity C9, electric capacity C15 and electric capacity C16 first end, electric capacity C9, electric capacity C15 and electric capacity C16 the second end ground connection；Inductance L5's
Second end is connected to resistance R3 first end, and resistance R3 the second end is connected to the transmitting of the transistor Q1 in white noise generator
Pole, that is to say, that the low-pass filtered device of+7V power supplys filters out ripple and then provides electric energy to white noise generator.The inductance L5
Logical direct current is exchanged for hindering.The present invention uses the electric capacity C9 of a Large Copacity, and the electric capacity C15 and electric capacity of two low capacities
The mode that C16 is in parallel substantially increases the filtering characteristic of ripple.White noise sound generation device is made up of transistor Q1, transistor Q1
Base earth, colelctor electrode is hanging, and emitter stage connects current-limiting resistance R3 the second end, while is connected to the first of coupled capacitor C17
End, i.e., be provided out white noise acoustic intelligence by coupled capacitor C17.White noise generator produces wideband using the breakdown characteristics of PN junction
The white noise of band.
Fig. 3 is the composition frame chart of work condition indicator provided by the invention.As shown in figure 3, working condition instruction dress
Put including single-chip microcomputer, LCDs, clock chip, Hall element and working state monitoring circuit, can show the working time,
Flow through the electric current of power-supply filter and the working condition that Tempest device is current.The Hall element, which is used to monitor, to flow
The electric current of power line is crossed, and exports the voltage signal of a current in proportion with flowing through power line, is then supplied to single-chip microcomputer；
Working state monitoring circuit is mainly that the quiescent potential of the white noise acoustic amplifier in Tempest device is judged, is seen
Whether its DC static operating point is in normal voltage range；Single-chip microcomputer mainly handles the information and working condition of Hall element output
The information of observation circuit output, and shown on LCDs；Clock chip is used to provide current temporal information, single
Piece machine is always according to the temporal information that clock chip provides in the current date Hour Minute Second of liquid crystal display screen display and anti-information
The working time of leakage device.
Fig. 4 is the circuit diagram of white noise acoustic amplifier provided by the invention.As shown in figure 4, white noise provided by the invention is put
Big device comprises at least two level, the preferred three-level of the present invention, and the amplifier is used to amplify white noise caused by noise generating device
Information, dialogue noise information is amplified third stage amplifier successively.First order amplifier, produced for amplifying noise generating device
Raw white noise signal, it is supplied to second level amplifier to continue to amplify after amplification, it is by the first amplification chip MAR-8+ and its outside
Circuit composition is enclosed, wherein, the first amplification chip MAR-8+ the 1st pin connection coupled capacitor C17 the second end, the 2nd and 4 pin connect
Ground, the 3rd pin connection coupled capacitor C18 first end, coupled electric capacity C18 provide drive signal to second level amplifier；Simultaneously
Power supply+5V gives amplification chip MAR-8+ to provide suitable quiescent point through biasing resistor R1 and inductance L6 successively, electric capacity C11 and
C12 plays ac short circuit ground connection.Second level amplifier is used to continue to amplify the white noise signal that first order amplifier is amplified,
It is supplied to third level amplifier to continue to amplify after amplification, it is made up of the second amplification chip MAR-8+ and its peripheral circuit, wherein,
Second amplification chip MAR-8+ the 1st pin connection coupled capacitor C18 the second end, the 2nd and 4 pin ground connection, the 3rd pin connection coupling electricity
Hold C19 first end, coupled electric capacity C19 provides drive signal to third level amplifier；Power supply+5V is successively through biased electrical simultaneously
Hinder R2 and inductance L7 and provide suitable quiescent point to amplification chip MAR-8+, electric capacity C13 and C14 play ac short circuit ground connection and made
With electric capacity C10 is used for the ripple for filtering out+5V power supplys.Third level amplifier is used to amplify the white noise that second level amplifier is amplified
Acoustical signal, it is supplied to rear class low pass filter to be filtered after amplification, it is by the 3rd amplification chip MAR-8+ and its peripheral circuit
Composition, wherein, the 3rd amplification chip MAR-8+ the 1st pin connection coupled capacitor C23 the second end, electric capacity C23 first end connects
Resistance R9 the second end is connected to, resistance R9 first end is connected to electric capacity C19 the second end；Resistance R9 is used to control output work
Rate；3rd amplification chip MAR-8+ the 2nd and 4 pin ground connection, the 3rd pin connection coupled capacitor C24 first end, coupled electric capacity
C24 provides signal to low pass filter；Power supply+5V carries through biasing resistor R4 and inductance L8 to amplification chip MAR-8+ successively simultaneously
For suitable quiescent point, electric capacity C21 and C22 play ac short circuit ground connection, and electric capacity C20 is used for the line for filtering out+5V power supplys
Ripple.
Fig. 5 is the circuit diagram of working condition classified Monitoring sub-circuit provided by the invention.As shown in figure 5, the present invention provides
Working condition classified Monitoring circuit include multistage operating status monitoring sub-circuit, the preferred three-level of the present invention, each level work shape
State monitoring sub-circuit includes：Comparator, level translator and isolator, the comparator are used to compare in Tempest device
White noise acoustic amplifier in first stage amplifier quiescent point voltage and threshold values to judge this grade of amplifier operation whether just
Often, level translator is used to provide threshold voltage, and comparative result is converted into high level or low level；Isolator be used for pair
Level translator is isolated.Comparator includes the first electric switch and the second electric switch, wherein, the first electric switch is by transistor
Q4, resistance R14, resistance R16 and diode D5 compositions, transistor Q4 emitter stage are connected to power supply+5V, current collection through resistance R14
Pole is connected to ground through resistance R16, is also attached to diode D5 negative pole, and base stage is connected to the first order amplifier in amplifier
Test side DT1；Diode D5 positive pole is connected to the input of level translator, i.e. resistance R7 and resistance R10 intermediate node.
Second electric switch is made up of diode D1, and diode D1 negative pole is connected to the test side of the first order amplifier in amplifier
DT1, positive pole are connected to the input of level translator, i.e. resistance R7 and resistance R10 intermediate node.
Level translator is by resistance R7, resistance R10, electric capacity C26, transistor Q2, resistance R5, resistance R8, resistance R11, electricity
R13, transistor Q3 and resistance R6 compositions are hindered, wherein, resistance R7 and R10 are in series, and are connected between power supply+5V and ground, its
Intermediate node is the input of level translator, and electric capacity C26 is simultaneously connected in resistance R10 both ends, for filtering out ripple, to prevent malfunction
Make.Resistance R5 and R8 are in series, and are connected between power supply+5V and ground, and wherein intermediate node provides for transistor Q2 emitter stage
One suitable quiescent point, transistor Q2 colelctor electrode are grounded through resistance R13, and base stage is connected to resistance R7 and gone here and there with R10 phases
The intermediate node of connection.Transistor Q3 works on off state, and its colelctor electrode is connected to power supply+5V through resistance R6, grounded emitter,
Base stage is connected to transistor Q2 colelctor electrode through resistance R11.
Isolator includes optoisolator PE, resistance R23 and resistance R24, wherein, light emitting diode in optoisolator PE
Positive pole meets positive supply+5V by resistance R23, and negative pole connects transistor Q3 colelctor electrode；The colelctor electrode of phototriode passes through resistance
R24 connects another positive supply, while connects an input of single-chip microcomputer, and emitter stage connects digitally.
Amplification chip MAR-8+ quiescent point is in 2.8-4V, in normal operating conditions, when first order amplifier
During normal work, it is connected to that DT1 transistor Q4 is in the conduction state, and diode D5 is in cut-off state, diode D1 is in
Cut-off state, the intermediate node voltage that resistance R7 and R10 are in series is unaffected, and transistor Q2 is in cut-off state, resistance R13
The voltage at both ends is zero, and transistor Q3 is also at cut-off state, and transistor Q3 collector voltage is+5V, in photoelectrical coupler
Light emitting diode do not light, the cut-off of light triode, the current collection extremely high level of phototriode, be one of single-chip microcomputer defeated
Enter end and high level is provided, represent that first order amplifier operation is normal.When the first amplifier MAR-8+ quiescent point is higher than 4V
When, in abnormal operating state, the diode D1 for being connected to DT1 is in cut-off state, and transistor Q4 is in cut-off state, and two
Pole pipe D5 is in the conduction state, and the intermediate node voltage that resistance R7 and R10 are in series is influenceed to become smaller than+2V by Q4 cut-offs,
Transistor Q2 is in the conduction state, and the voltage at resistance R13 both ends is more than 1V, and transistor Q3 is in saturation conduction state, transistor
Q3 collector voltage is less than 1V, the lumination of light emitting diode in photoelectrical coupler, the conducting of light triode, phototriode
Current collection extremely low level, low level is provided for an input of single-chip microcomputer, represents that first order amplifier operation is abnormal；When
When one amplification chip MAR-8+ quiescent point is less than 2.8V, in abnormal operating state, DT1 diode D1 is connected to
In the conduction state, transistor Q4 is in the conduction state, and diode D5 is in cut-off state, during resistance R7 and R10 are in series
Intermediate node voltage is influenceed to become smaller than+3.5V by D1 conductings, and transistor Q2 is in the conduction state, the voltage at resistance R13 both ends
More than 1V, transistor Q3 is in saturation conduction state, and transistor Q3 collector voltage is less than 1V, luminous in photoelectrical coupler
LED lighting, light triode conducting, the current collection extremely low level of phototriode, is provided for an input of single-chip microcomputer
Low level, represent that first order amplifier operation is abnormal.
For the working state monitoring sub-circuit and monitoring white noise of the second level amplifier for monitoring white noise acoustic amplifier
The work of the working state monitoring sub-circuit of the third level amplifier of amplifier and the first order amplifier of monitoring white noise acoustic amplifier
Make that the circuit structure of status monitoring sub-circuit is identical, and the course of work is similar, narration is not repeated herein.Except that second
The working state monitoring sub-circuit of level amplifier is used for the operating point for monitoring DT2 points, the working state monitoring of third level amplifier
Sub-circuit is used for the operating point for monitoring DT3 points.
Fig. 6 is the circuit diagram of low pass filter provided by the invention, as shown in fig. 6, low pass filter provided by the invention
For 7 rank Chebyshev filters, by inductance L10, inductance L11, inductance L9, inductance L12, electric capacity C27, electric capacity C28, electric capacity C29,
Electric capacity C25 is formed.Due to noise signal, broader bandwidth, if without restriction, it is likely that influence it caused by triode breakdown
Its signal, then after noise is produced, by it by low pass filter, its bandwidth is set to limit within the specific limits, the present invention
It is preferred that passband operating frequency range is 0MHz to 300MHz.
Elaborated with reference to design of the accompanying drawing to the present invention and example above, but those skilled in the art should recognize
Know, on the premise of without departing from present inventive concept, any modifications and variations made based on the present invention still fall within this hair
Content in bright protection domain.
Claims (3)
1. a kind of working condition classified Monitoring circuit, it is characterised in that including multistage operating status monitoring sub-circuit, per one-level bag
Include：Comparator, level translator and isolator, the comparator are used to compare the white noise acoustic amplifier in Tempest device
In first stage amplifier quiescent point voltage with threshold values to judge whether this grade of amplifier operation normal, level translator use
In offer threshold voltage, and comparative result is converted into high level or low level；Isolator is used to carry out level translator
Isolation, comparator include the first electric switch and the second electric switch, wherein, the first electric switch is by the first transistor (Q4), the first electricity
(R14), second resistance (R16) and the first diode (D5) composition are hindered, the emitter stage of the first transistor (Q4) is through first resistor
(R14) power supply is connected to, colelctor electrode is connected to ground through second resistance (R16), is also attached to the first diode (D5) negative pole, base
Pole is connected to the test side (DT1) of the first order amplifier in amplifier；First diode D5 positive pole is connected to level conversion
The input of device;Second electric switch is made up of the second diode (D1), and the negative pole of the second diode (D1) is connected in amplifier
First order amplifier test side (DT1), positive pole is connected to the input of level translator.
2. working condition classified Monitoring circuit according to claim 1, it is characterised in that the white noise amplifying circuit is extremely
Include two-stage less.
3. working condition classified Monitoring circuit according to claim 2, it is characterised in that the multistage operating status monitoring
Sub-circuit comprises at least two-stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410829226.2A CN104539283B (en) | 2014-12-29 | 2014-12-29 | Working condition classified Monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410829226.2A CN104539283B (en) | 2014-12-29 | 2014-12-29 | Working condition classified Monitoring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104539283A CN104539283A (en) | 2015-04-22 |
| CN104539283B true CN104539283B (en) | 2017-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410829226.2A Active CN104539283B (en) | 2014-12-29 | 2014-12-29 | Working condition classified Monitoring circuit |
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| CN2672706Y (en) * | 2004-01-19 | 2005-01-19 | 龙德浩 | Leaking information protector for computer |
| CN200986578Y (en) * | 2006-12-29 | 2007-12-05 | 摩比天线技术（深圳）有限公司 | Low noise amplifier monitor alarming device |
| US7629795B2 (en) * | 2007-07-30 | 2009-12-08 | John D. Terleski | Vector impedance measurement system and method of using same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024718A (en) * | 2005-07-19 | 2007-02-01 | Agilent Technol Inc | Control method and control program of semiconductor characteristics measuring device |
| CN204376866U (en) * | 2014-12-29 | 2015-06-03 | 李大庆 | Operating state classified Monitoring circuit |
-
2014
- 2014-12-29 CN CN201410829226.2A patent/CN104539283B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2672706Y (en) * | 2004-01-19 | 2005-01-19 | 龙德浩 | Leaking information protector for computer |
| CN200986578Y (en) * | 2006-12-29 | 2007-12-05 | 摩比天线技术（深圳）有限公司 | Low noise amplifier monitor alarming device |
| US7629795B2 (en) * | 2007-07-30 | 2009-12-08 | John D. Terleski | Vector impedance measurement system and method of using same |
Non-Patent Citations (1)
| Title |
|---|
| "使用Multisim进行电子电路故障诊断";钱月花;《沙洲职业工学院学报》;20090630;第12卷(第2期);第24-27,30页 * |
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| CN104539283A (en) | 2015-04-22 |
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Effective date of registration: 20230829 Address after: Building 301-1, Building 16, Tongguang Group, No. 185 Xinda Road, Wanghailou Street, Hebei District, Tianjin, 300000 Patentee after: Tianjin Chimei Data Technology Co.,Ltd. Address before: Room 401-26-14, Block G, Haitai Green Industrial Base, No. 6, Haitai Development Sixth Road, Huayuan Industrial Zone, Binhai New Area, Tianjin, 300000 Patentee before: Tianjin Rongxing Group Co.,Ltd. |