CN2938622Y - Local network computer anti-theft alarm with anti-destroy function and self-detection controlled by network wire - Google Patents
Local network computer anti-theft alarm with anti-destroy function and self-detection controlled by network wire Download PDFInfo
- Publication number
- CN2938622Y CN2938622Y CN 200620130735 CN200620130735U CN2938622Y CN 2938622 Y CN2938622 Y CN 2938622Y CN 200620130735 CN200620130735 CN 200620130735 CN 200620130735 U CN200620130735 U CN 200620130735U CN 2938622 Y CN2938622 Y CN 2938622Y
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- circuit
- alarm
- cabinet
- transducer
- netting twine
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- Alarm Systems (AREA)
Abstract
The utility model relates to an alarm, particularly a network line controlled destruction-proof self-checking LAN computer burglarproof alarm. The utility model comprises a clock pulse generator, a hexadecimal counter, a 56-way electronic switch and a display circuit. The alarm is characterized in that the alarm also comprises an enclosure sensor, an idle network line, a changeover circuit of the enclosure sensor and an analog enclosure sensor, an identification and control circuit, a starting delay circuit and an alarm circuit, wherein the enclosure sensor sends the signal generated to changeover circuit of the enclosure sensor and the analog enclosure sensor via the idle network line, and then to the identification and control circuit via the 56-way electronic switch. If the enclosure sensor or the network line is broken or short-circuited, the bypass signal can identify and then gives an alarm. To prevent false alarm, a starting delay circuit is also provided, and the alarm circuit includes a site alarm circuit and a remote alarm circuit. The utility model is stable, reliable, easy to install and has powerful destruction-proof function, without affecting the normal maintenance and repair.
Description
Technical field
The utility model relates to alarm, refers in particular to a kind of local area network (LAN) computer theft deterent alarm that utilizes the tamper-proof energy self check of netting twine control.
Background technology
Computer antitheft does not adopt anti-theft measure mostly in the computer room of units such as Internet bar and each middle school, universities and colleges computer classroom and each R﹠D institution, bank at present, and individual other adopts the way of various machineries.But because of with low content of technology, unreliable, destructible, can not monitor in real time, still hard to guard against, can't satisfy the requirement of computer antitheft.In addition, have only a few to adopt wireless alarm, radio alarming shortcoming to have four: 1, wirelessly be subject to disturb 2, battery is short service time, nothing was indicated after frequently replacing battery trouble 3, battery had electricity, easily cause and fail to report police 4, cost height, the battery expense is big, and user's difficulty is born.
Summary of the invention
The purpose of this utility model is improved and is innovated at the shortcoming that exists in the background technology and problem, and a kind of tamper-proof local area network (LAN) computer theft deterent alarm that can self check that utilizes netting twine control is provided.
The technical solution of the utility model is: construct a kind of employing electronic technology, be used for computer and concentrate local computer antitheft alarm, the computer of being monitored is carried out timing monitoring, the utility model contains clock pulse generator, 56 system counters, No. 56 electronic switches and display circuit, the described alarm of its feature also comprises the cabinet transducer, vacant netting twine, cabinet transducer and simulation cabinet transducer change-over circuit, identification and control circuit, the start delay circuit, warning circuit, the improper signal that wherein said cabinet transducer will produce reaches cabinet transducer and simulation cabinet transducer change-over circuit by vacant netting twine, by No. 56 electronic switches signal is gone to identification and control circuit again, opening circuit wherein from cabinet transducer or netting twine, short circuit, by-passing signal all can be discerned and be reported to the police, in order not report by mistake, also be provided with the start delay circuit, warning circuit is divided into onsite alarming and remote alarms.
The utility model utilizes netting twine idle line transmission signals, need not every other wiring of computer, promptly guaranteed the reliable and stable of wire transmission signal, and can resemble convenient and flexible installation the wireless alarm again, reduced installation difficulty, saved the time, reduced cost.Powerful tamper-proof function is arranged, anti-artificial with the netting twine bypass, open circuit, short circuit.Even the expert also can't destroy, improved reliability greatly.The utility model work the time is digital signal, and is highly sensitive so working stability is reliable, from theoretical and in fact solved wrong report, fail to report phenomenon; And itself just has self-checking function, can put things right once and for all so in a single day this alarm installs, and need not regularly replace battery (use AC power), also need not check circuit etc., shows promptly that in variation complete machine and line work are all normal as long as charactron shows numeral.Do not influence the conventional maintenance and the repairing of computer, be out of order as computer and take out out sensor plug and the corresponding reticle plug provided maintenance of can moving behind of alarm main frame.Lower than other alarm cost, the user can accept, and market prospects are good.
Description of drawings
Fig. 1 is the utility model block diagram
Fig. 2 is the utility model identification and control, shows time-delay, warning circuit electrical schematic diagram
Fig. 3 is No. 56 electronic switches, 56 system counters, clock pulse generator, cabinet transducer and simulation cabinet transducer change-over circuit electrical schematic diagram
Embodiment
By Fig. 1 to 3 as can be known, the utility model contains clock pulse generator, 56 system counters, No. 56 electronic switches and display circuit, be characterized in that described alarm also comprises the cabinet transducer, vacant netting twine, cabinet transducer and simulation cabinet transducer change-over circuit, identification and control circuit, the start delay circuit, warning circuit, wherein said cabinet transducer reaches cabinet transducer and simulation cabinet transducer change-over circuit with the signal that produces by vacant netting twine, by No. 56 electronic switches signal is reached identification and control circuit again, opening circuit wherein from cabinet transducer or netting twine, short circuit, by-passing signal all can be discerned and be reported to the police, in order not report by mistake, also be provided with the start delay circuit, warning circuit is divided into onsite alarming and remote alarms.
Cabinet transducer described in the utility model is made up of sensitive switch K0-K55 and resistance 2R0-2R55, and the sensitive switch contact is in normally off, i.e. an end of No. 56 electronic switches is received after sensitive switch and the resistance string ground connection again by netting twine.Described vacant netting twine, five classes, eight core netting twines have 4 pairs, and 2 pairs are used for being connected of computer and network, 2 pairs of vacant utilizations, 1 couples transmission cabinet sensor signal wherein.Described cabinet transducer and simulation cabinet transducer change-over circuit are made up of the plug of socket X0-X55, R0-R55 and cabinet transducer, are exactly sensor signal with plug insertion socket, otherwise are analog sensor signal.Described identification and control circuit are made up of bridge circuit, switch delay circuit, display circuit, onsite alarming circuit, remote alarms circuit, and wherein the RA resistance is at random in the bridge circuit, and whether RA is detected balance, promptly report to the police as disequilibrium; In order not report by mistake, the contact of start delay circuit K1-1 is connected, and makes the control utmost point G ground connection of SCR1, and SCR1 can't be worked; Display is in cycle count and the show state of 0-55 in the display circuit, in case warning SCR1 provides a locking signal to display circuit, promptly shown number is exactly stolen computer numbering; Electric bridge is unbalance in the onsite alarming circuit, the SCR1 conducting; After R66 and C5 time-delay, the SCR2 conducting, K2 adhesive K2-1 contact is connected onsite alarming; In the remote alarms circuit after alarm signal, the SCR2 conducting, the K2 adhesive, the K2-2 contact is connected wireless or the wired alarming system promptly reports to the police.
The utility model circuit is formed and operation principle:
1, pulse signal generator of clock.Form by IC25, R57, R58, R59, C1, C2, by the 3 pin output square-wave signal of IC25, frequency 300HZ, effect has 3: 1. provide clock pulse to 56 system counters, make 56 system counters carry out cycle count from 0-55.2. to open circuit, short circuit, bypass identification circuit be bridge circuit, and pulse power voltage is provided.3. provide clock pulse to display circuit, and make display circuit and 56 system counter synchronisation, the number that makes demonstration promptly is the number that 56 system counters are counted.
2,56 system counters.Form by IC1-IC10.Under the effect of clock pulse, 56 system counters are from 0-55 cycle count ceaselessly, and 56 outputs are linked 56 road electronics and closed, and corresponding one by one, make No. 56 electronic switches take turns conducting.
3, No. 56 electronic switches.Form by IC11-IC24, IC11-IC24 is a CMOS4 bidirectional analog switch, each IC inside respectively have 4 independently can control figure or the switch of analog signal, 56 outputs in this programme 56 control ends of No. 56 electronic switches being received 56 system counters are corresponding one by one, 56 of No. 56 electronic switches input 56 cabinet transducers of termination or simulation cabinet transducer, 56 outputs and linking are received A together and are delivered to bridge circuit and compare.Because 56 system counters are cycle count constantly, make the circulation of No. 56 electronic switches open, when 56 system counter roads output high level, corresponding No. 56 electronic switches are just opened, deliver to after the resistance addition with resistance on the cabinet transducer and the internal resistance of electronic switch own after electronic switch is opened open circuit, short circuit, bypass identification circuit, be that bridge circuit compares, and by open circuit, short circuit, bypass identification circuit make respective handling.
4, cabinet transducer and simulation cabinet transducer change-over circuit are made up of the plug of socket X0-X55, R0-R55 and cabinet transducer.Effect: the port of the case transducer that is used for not meeting sb. at the airport, suppose not fill the computer number that adds up to 56, just there are not 56 transducers, there is not the port of transducer, because of electronic switch is in open-circuit condition, will report to the police.In order not report to the police, having used simulation cabinet transducer is that 2R0-2R55 replaces the cabinet transducer.Conversion is whether to utilize the insertion of plug and socket.Having plug to insert is exactly the signal of transducer, and not having plug to insert is exactly the signal of analog sensor.The cabinet transducer passes through netting twine, netting twine other end plug, insert then because the reed that has connect simulation cabinet transducer on the socket is backed down at the plug top as plug, make plug and the connection of No. 56 electronic switches that is connected to the cabinet transducer and be sent to bridge circuit to compare; When not inserting sensor plug, as the maintenance of will moving of being out of order because of computer, and when plug pulled out or original when just not filling 56 computers, the reed that socket has connect simulation cabinet transducer is switched to electronic switch automatically, the resistance of simulating the cabinet transducer is sent to electric bridge compares, avoided the situation of reporting to the police because of the case transducer of not meeting sb. at the airport.
5, vacant netting twine.Five classes, eight core netting twines have 4 pairs, have 2 pairs to be used for connecting of computer and network, and 2 pairs of vacant netting twines are arranged in addition, utilize 1 couple transmission cabinet sensor signal wherein, have removed the trouble that every computer is wired to the alarm main frame from.
6, cabinet transducer, i.e. sensitive switch and resistance in the frame of broken lines among the figure.Replace the cabinet transducer with RA when analyzing bridge circuit, the cabinet transducer is made up of sensitive switch K0 K55 and resistance 2R0 2R55.Effect: transducer produces signal and makes circuit alarm when stealing computer if any the people.The sensitive switch contact is in normally off at ordinary times, after promptly an end of No. 56 electronic switches is received sensitive switch K and resistance 2R polyphone by netting twine, arrives ground again.Open chassis lid if any the people, the sensitive switch contact becomes normally open immediately, and No. 56 electronic switches promptly are in open-circuit condition; Cut off the netting twine electronic switch if any the people and also be open-circuit condition; With the netting twine short circuit or the people is arranged with the netting twine bypass, the resistance of cabinet transducer is 0 or diminishes that four kinds of situations all can be reported to the police if any the people.
7, open circuit, short circuit, bypass, identification and control is by R60-R66, RA, IC28, IC29, C3, C4, C5, K1, K2, compositions such as SCR1, SCR2.Wherein R60, R61, R62, RA (RA adds the cabinet sensor resistance for the electronic switch internal resistance) form bridge circuit, electric bridge two arm balances then when 4 resistances of electric bridge are identical, 2 no-voltages outputs of A, B.Now R60, R61, R62 are that fixed resistance and resistance are identical, and having only the RA resistance is at random, so bridge circuit carries out the detection of per second 300 times to RA, whether promptly detect balance.Just often, bridge balance, 2 no-voltage outputs of A, B, alarm free and demonstration.When the people opened the computer housing lid or cuts off netting twine, because of sensitive switch disconnects or the netting twine disconnection, making RA resistance was open-circuit condition, and the electric bridge disequilibrium produces the negative voltage of the positive B of A, IC28 conducting this moment, and SCR1, SCR2 conducting, beginning to report to the police and locking shows; During with netting twine short circuit or bypass, RA resistance is 0 or diminishes as the people, and the negative positive voltage of B of A can appear in electric bridge justice disequilibrium, IC29 conducting this moment, and SCR1, SCR2 conducting, reporting to the police also shows.
IC28, IC29 are photoelectrical coupler, are used for the coupling between electric bridge and the SCR1, and adopting the photoelectric coupled device purpose is in order to reduce the influence of back level to electric bridge, as long as IC28, IC29 have a conducting, the SCR1 conducting, SCR2 is conducting also, the K2 adhesive is also reported to the police, and has produced 2 effects after the SCR1 conducting:
(1) locking signal is provided for display circuit IC26, IC27, which warning makes display circuit show and lock is.
(2) provide triggering signal to SCR2, after the SCR2 conducting, the K2-1 contact is connected the warning signal onsite alarming, and the K2-2 contact is connected remote alarms, also can automatically lock after the warning, also reports to the police even the thief restores to the original state, and turns off up to power supply.
8, the start delay circuit is made up of BG1, K1, R64, C3, C4.The VDD supply voltage has one from 0 to 12V rising and stabilization process during start just, this process is prone to wrong report, in order not report by mistake, the contact of start delay circuit K1-1 is connected, and makes the control utmost point G ground connection of SCR1, SCR1 can't be worked, so do not report to the police, after 12V voltage was stable, the delay circuit time-delay finished, the K1-1 contact disconnects, and complete machine begins operate as normal.
9, display circuit is made up of IC26, IC27 and two charactrons and R67 R72-.Clock pulse signal makes display be in cycle count and the show state of 0-55 at ordinary times, in case report to the police, SCR1 provides a locking signal to display circuit, and the numeral that show this moment promptly is the numbering number of stolen computer.
10, onsite alarming circuit is made up of SCR2 and warning signal, R66, C5, C6.After unusual resistance appearred in the cabinet transducer, the electric bridge disequilibrium made the SCR1 conducting, after the SCR1 conducting, and after R66 and C5 time-delay, the SCR2 conducting, the K2 adhesive, the K2-1 contact is connected warning signal and is realized onsite alarming.
11, wireless, wired remote is reported to the police, and is made up of SCR2 and K2-2.After alarm signal, the SCR2 conducting, the K2 adhesive, the K2-2 contact is connected wireless sender or is connected the wired alarming system, realizes remote alarms.
The utility model workflow:
1, opening the computer housing lid as the people wants to steal CPU or memory bar or cuts off the netting twine stealing, think when alarm can lose efficacy, the sensitive switch of cabinet transducer can disconnect, or netting twine disconnection both of these case all can be directed at resistance infinity on the cabinet sensing, signal on the transducer passes to No. 56 electronic switches by vacant netting twine, No. 56 electronic switches under the effect of clock pulse generator and 56 system counters to take turns conducting with the speed of per second 300 times, the control end of the output of 56 system counters and No. 56 electronic switches links to each other and is corresponding one by one, the every counting of 56 system counters once, just conducting is once successively for electronic switch, every conducting one tunnel, just with this road cabinet transducer with open circuit, bypass, the short circuit identification circuit more ceaselessly scans each road and compares.When certain road cabinet resistance is infinitely great, also just being equivalent to RA and not having resistance, the bridge circuit of open circuit, short circuit, bypass identification circuit promptly being made up of R60, R61, R62, RA can disequilibrium, can produce the negative voltage of a positive B of A A, B at 2, this voltage makes the IC28 conducting, the SCR1 conducting, provide a lock count signal to display circuit after the SCR1 conducting, and show; Return SCR2 in addition triggering signal is provided, make the SCR2 conducting, the K2 adhesive, the K2-1 contact is connected onsite alarming, and wireless, wired remote warning that the K2-2 contact is connected realizes remote alarms.When preventing to start shooting because the wrong report that spread of voltage causes increases the start delay circuit, make voltage stable after, control circuit is just worked.
2, when the people lost efficacy alarm netting twine short circuit or bypass attempt, the cabinet sensor signal passes to No. 56 electronic switches by vacant netting twine, when electronic switch is conducting to this road, be that RA resistance is delivered to bridge arm ratio with this road sensor resistance, because of RA is 0 or diminishes, make the electric bridge disequilibrium again, at A, the negative positive voltage of B of B two ends output A, this voltage makes the IC29 conducting, the SCR1 conducting, provide a lock count signal to display circuit after the SCR1 conducting, and show; Return SCR2 in addition triggering signal is provided, make the SCR2 conducting realize onsite alarming and wireless, wired remote warning.
Embodiment described in the utility model only is the description that preferred implementation of the present utility model is carried out; be not that the utility model design and scope are limited; do not breaking away under the preceding topic of the utility model design philosophy; engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection range of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.
Claims (5)
1, a kind of local area network (LAN) computer theft deterent alarm that utilizes the tamper-proof energy self check of netting twine control, contain clock pulse generator, 56 system counters, No. 56 electronic switches and display circuit, it is characterized in that described alarm also comprises the cabinet transducer, vacant netting twine, cabinet transducer and simulation cabinet transducer change-over circuit, identification and control circuit, the start delay circuit, warning circuit, wherein said cabinet transducer reaches cabinet transducer and simulation cabinet transducer change-over circuit with the signal that produces by vacant netting twine, by No. 56 electronic switches signal is reached identification and control circuit again, cabinet transducer or netting twine are if any opening circuit, short circuit, by-passing signal all can be discerned and be reported to the police, in order not report by mistake, also be provided with the start delay circuit, warning circuit is divided into onsite alarming and remote alarms.
2, the local area network (LAN) computer theft deterent alarm that utilizes the tamper-proof energy self check of netting twine control according to claim 1, it is characterized in that described cabinet transducer, form by sensitive switch KO-K55 and resistance 2R0-2R55, the sensitive switch contact is in normally off, an i.e. end of No. 56 electronic switches is received after sensitive switch and the resistance string ground connection again by netting twine.
3, the local area network (LAN) computer theft deterent alarm that utilizes the tamper-proof energy self check of netting twine control according to claim 1, it is characterized in that described vacant netting twine, five classes, eight core netting twines have 4 pairs, 2 pairs are used for being connected of computer and network, 2 pairs of vacant utilizations, 1 couples transmission cabinet sensor signal wherein.
4, the local area network (LAN) computer theft deterent alarm that utilizes the tamper-proof energy self check of netting twine control according to claim 1, it is characterized in that described cabinet transducer and simulation cabinet transducer change-over circuit, plug by socket X0-X55, R0-R55 and cabinet transducer is formed, with plug insertion socket is exactly sensor signal, otherwise is analog sensor signal.
5, the local area network (LAN) computer theft deterent alarm that utilizes the tamper-proof energy self check of netting twine control according to claim 1, it is characterized in that described identification and control circuit be made up of bridge circuit, start delay circuit, display circuit, onsite alarming circuit, remote alarms circuit, wherein the RA resistance is at random in the bridge circuit, whether RA is detected balance, promptly report to the police as disequilibrium; In order not report by mistake, the contact of start delay circuit K1-1 is connected, and makes the control utmost point G ground connection of SCR1, and SCR1 can't be worked; Display is in cycle count and the show state of 0-55 in the display circuit, in case warning SCR1 provides a locking signal to display circuit, shown number promptly is stolen computer numbering; Electric bridge is unbalance in the onsite alarming circuit, the SCR1 conducting; After R66 and C5 time-delay, the SCR2 conducting, K2 adhesive K2-1 contact is connected onsite alarming; In the remote alarms circuit after alarm signal, the SCR2 conducting, the K2 adhesive, the K2-2 contact is connected wireless or the wired alarming system promptly reports to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620130735 CN2938622Y (en) | 2006-07-27 | 2006-07-27 | Local network computer anti-theft alarm with anti-destroy function and self-detection controlled by network wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620130735 CN2938622Y (en) | 2006-07-27 | 2006-07-27 | Local network computer anti-theft alarm with anti-destroy function and self-detection controlled by network wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2938622Y true CN2938622Y (en) | 2007-08-22 |
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ID=38362651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620130735 Expired - Fee Related CN2938622Y (en) | 2006-07-27 | 2006-07-27 | Local network computer anti-theft alarm with anti-destroy function and self-detection controlled by network wire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2938622Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191899A (en) * | 2013-02-26 | 2013-07-10 | 上海宏力半导体制造有限公司 | Exhaust alarm all clear method |
-
2006
- 2006-07-27 CN CN 200620130735 patent/CN2938622Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191899A (en) * | 2013-02-26 | 2013-07-10 | 上海宏力半导体制造有限公司 | Exhaust alarm all clear method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |