CN2407408Y - Electronic theftproof alarm - Google Patents
Electronic theftproof alarm Download PDFInfo
- Publication number
- CN2407408Y CN2407408Y CN 99248618 CN99248618U CN2407408Y CN 2407408 Y CN2407408 Y CN 2407408Y CN 99248618 CN99248618 CN 99248618 CN 99248618 U CN99248618 U CN 99248618U CN 2407408 Y CN2407408 Y CN 2407408Y
- Authority
- CN
- China
- Prior art keywords
- amplifier
- alarm
- operational amplifier
- relay
- power amplifier
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model relates to an electronic theftproof alarm. The utility model comprises a detecting system, an alarming system, and a relay, wherein, the detecting system is composed of a differential detecting amplifier, an operational amplifier, and a power amplifier; the alarming system is composed of an audio frequency generator, an audio frequency amplifier, and an alarm. The device has the advantage of simple structure. The utility model is suitable for industrial and mineral conditions.
Description
The utility model relates to a kind of burglar alarm, is specially adapted to the burglar alarm of outdoor article.
At present the stolen phenomenon of outdoor cable is more serious, and safeguard procedures commonly used are to strengthen the patrol in cable laying zone, patrol and examine, but this method to the cable laying scope wide built on stilts lay etc. situation because of manpower limited or be not easy to patrol and examine produce effects little.Can place the infrared ray alarm at the primary location of cable laying in addition, its principle is can report to the police automatically after the people enters the zone, but this equipment manufacturing cost height, and be not suitable for the factories and miness that resemble this high temperature with high dust of metallurgical steel mill.
The purpose of this utility model just provide a kind of can environment relatively poor the zone in the realization burglar alarm.
The utility model relates to a kind of burglar alarm, comprise detection system, warning system and relay, detection system is made up of differential detection amplifier, operational amplifier, power amplifier, warning system is made up of audio-frequency generator, note amplifier, alarm, differential detection amplifier, operational amplifier, power amplifier connect the back successively and link to each other with the relay input end, and relay output end is connected successively with audio-frequency generator, note amplifier, alarm.
The differential detection amplifier is by BG1, BG2, BG3, R1-R9, and RW1 forms.
Operational amplifier comprises resistance R 11-R13, and elements such as RW2 adjustable potentiometer are formed.Power amplifier is made up of OCL direct current amplifying circuit.Alarm is by R31, C31, and T1, R32, R33, C32 forms.
In recent years, overhead traveling crane slip cable, main span overhead traveling crane compensating cable, converter oxygen gun cable were repeatedly stolen in the mad crime of thief, caused bigger loss to production.After our factory had taked cable theft-prevention to steal measure in 98 years; thief once repeatedly took place just commits a crime; alarm in time gives the alarm; operator on duty notice is protected and is protected the personnel of team of the factory scene that arrives in the very nick of time after the team of factory; dispersed thief; protect cable, retrieved the direct economic loss of hundreds of thousands unit for our factory.This is practical simple in structure, is fit to the relatively poor place of industrial and mineral condition and uses.
Below in conjunction with accompanying drawing this utility model is described in detail,
Accompanying drawing 1 is an electronic anti-theft warning work block diagram
Accompanying drawing 2 is electronic anti-theft alarm schematic diagrams
As shown in Figure 1, twining the peripheral fine rule of cable links to each other with differential amplifier (1) input end.Be responsible for detecting the on-the-spot situation that is wrapped in the antitheft fine rule in the cable outside, destroyed fine rule ground connection, short circuit take place, open circuit or the differential wave of resistance differential sensor (1) when changing when changing Ua ≠ Ub because of the theft cable when on-the-spot fine rule has the people, operational amplifier (2) input terminal voltage changes, and output voltage output Uo is arranged after operational amplifier (2) amplifies.The sensitivity level of system can be realized by transferring RW2.When operational amplifier (2) has voltage output (Uo ≠ 0), make power amplifier (3) input end that voltage be arranged through R14, and make power amplifier (3) work.BG11 when U0 is forward voltage, BG13, BG15 work makes relay (J) adhesive; BG12 when U0 is negative voltage, BG14, BG16 work makes relay (J) adhesive produce the alerting signal input by R31, C31, T1, R32, R33, the audio-frequency generator (5) that C32 forms, and through BG31, the note amplifier (6) that BG32 forms drives alarm (7) and sends alarm sound.
After relay (J) adhesive, illustrate that on-the-spot fine rule physical parameter situation changes, the junction closure of relay makes loudspeaker send sound and reports to the police.
Above-mentioned as shown in Figure 2 burglar alarm is described in detail as follows:
1. differential detection amplifier:
By external circuit and interior circuit R1--R9, RW1, BG1, BG2, BG3 forms a differential detection amplifying circuit, and wherein, R1--R9 has chosen parameter in circuit design, and therefore, the base voltage electric current of BG2 is certain value (Ub is certain value).By R8, R9, R10 and BG3 form constant-current source circuit, guarantee the differential amplifier (as: temperature variation of under various site environments, working, voltage fluctuation, electromagnetic interference (EMI) etc.), after the resistance of external circuit is certain value (according to actual unwrapping wire in scene and winding), by R1, RW1, RX, R2, R3 resistance is formed a bias pressure circuit to the BG1 transistor base, by adjusting RW1 the base voltage Ub1 of BG1 is changed, according to＜burglar alarm〉designing requirement, after the field monitoring line construction is finished, need to adjust the RW1 potentiometer, and make the collector voltage Ua=Ub of BG1 and BG2 make differential amplifier be operated in the state of system balancing.
2. operational amplifier:
Operational amplifier is by C11, R11--R14, and RW2, D1--D2 and integrated operational amplifier are formed, and press the operational amplifier operating characteristic:
Wherein: the output voltage of U0--operational amplifier
The input voltage of Uab--operational amplifier
The input resistance of R11--operational amplifier
The output resistance of R13--operational amplifier
The output adjustable resistance of RW2--operational amplifier by the formula of above-mentioned differential amplifier operating characteristic as can be known, the output voltage U 0=0 of operational amplifier when Uab=0.
By adjusting the enlargement factor that the RW2 variable resistor can change operational amplifier, realization＜electronic anti-theft alarm〉sensitivity.
3. power amplifier and relay system:
Power amplifier is by R21--R28, BG11--BG16, and D11--D12 forms, and is the transistor OCL power amplifier of a standard, and wherein: BG11, BG13, BG15 are positive control.BG12, BG14, BG16 are negative control.As the OCL power amplifier in manufacturing be with parameter adjustment:
When U0=0, the balance duty of U output=0, therefore, when the output voltage U 0=0 of " operational amplifier " of prime, the output voltage of its power amplifier (U output=0) makes not adhesive of relay J, does not produce alerting signal.4. audio-frequency generator and note amplifier:
R31, R32, R33, C31, C32, T1 forms an easy unijunction transistor sawtooth wave audio-frequency generator.By changing the parameter of resistance R 31 and capacitor C 31, can change the frequency of audio frequency, and send sound signal.
R34, R35, R36 and BG31, BG32 forms a simple complex pipe power amplifier, and the off beat frequency signal that C32 is transmitted amplifies, and can drive loudspeaker can sound.
By in the principle analysis of above each system as can be seen, when nobody breaks when the field monitoring fine rule, the electronic alarm system works under equilibrium state, not adhesive of relay J, system speaker and luminotron are not reported to the police, system is in the work of normal monitoring.
Electronic anti-theft device will be reported to the police when the field monitoring fine rule is artificially touched and cause down several situations of fine rule parameter generation to change:
(a) fine rule is by sawed-off:
Make the base stage bias current cut-off of BG1, Ub1=0 makes BG1 enter cut-off state by magnifying state, Ua＞Ub
(b) fine rule resistance artificial destruction sealing-in diminishes:
The resistance of on-the-spot fine rule resistance is as diminishing, and BG1 bias current current Ib 1 becomes big, and BG1 trends towards satisfying and closes Ua＜Ub
(c) artificial destruction of fine rule resistance becomes big:
When the artificial destruction of fine rule resistance became big with the resistance of on-the-spot fine rule resistance, BG1 bias current current Ib diminished, and BG1 trends towards ending.Ua＞Ub
(d) fine rule is by artificial ground:
When fine rule makes the base voltage Ub1=0 of BG1 during by artificial ground, the Uce3 that involves BG3 simultaneously makes the BG3 cisco unity malfunction, makes system's cisco unity malfunction.Ua≠Ub
More than four kinds of situations all can break the balance duty of former differential amplifier, make Ua ≠ Ub.
When the input voltage Ua of operational amplifier ≠ Ub, by above-mentioned each system works principle as can be known the equilibrium state of operational amplifier and power amplifier broken, when operational amplifier has output voltage V 0＞0, power amplifier then has output voltage (U output), and make the relay J adhesive, report to the police to the operator on duty through contacting loudspeaker and light emitting diode.
Claims (5)
1. burglar alarm, comprise detection system, warning system and relay (4), it is characterized in that: detection system is made up of differential detection amplifier (1), operational amplifier (2), power amplifier (3), warning system is made up of audio-frequency generator (5), note amplifier (6), alarm (7), differential detection amplifier (1), operational amplifier (2), power amplifier (3) connect the back successively and link to each other with relay (4) input end, and relay (4) output terminal is connected successively with audio-frequency generator (5), note amplifier (6), alarm (7).
2. burglar alarm as claimed in claim 1 is characterized in that: differential detection amplifier (1) is by BG1, BG2, BG3, R1-R9, and RW1 forms.
3. burglar alarm as claimed in claim 1 is characterized in that: operational amplifier (2) comprises resistance R 11-R13, and elements such as RW2 adjustable potentiometer are formed.
4. burglar alarm as claimed in claim 1 is characterized in that: power amplifier is made up of OCL direct current amplifying circuit.
5. burglar alarm as claimed in claim 1 is characterized in that: alarm is made up of R31 C31 T1 R32 R33 C32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99248618 CN2407408Y (en) | 1999-09-29 | 1999-09-29 | Electronic theftproof alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99248618 CN2407408Y (en) | 1999-09-29 | 1999-09-29 | Electronic theftproof alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2407408Y true CN2407408Y (en) | 2000-11-22 |
Family
ID=34033758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99248618 Expired - Fee Related CN2407408Y (en) | 1999-09-29 | 1999-09-29 | Electronic theftproof alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2407408Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016054883A1 (en) * | 2014-10-09 | 2016-04-14 | 中兴通讯股份有限公司 | Warning signal generating device, base station power equipment and base station power system |
-
1999
- 1999-09-29 CN CN 99248618 patent/CN2407408Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016054883A1 (en) * | 2014-10-09 | 2016-04-14 | 中兴通讯股份有限公司 | Warning signal generating device, base station power equipment and base station power system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202196479U (en) | System for monitoring external damage to overhead transmission line | |
| CN111179529A (en) | Power cable prevents destroying early warning system | |
| CN102737462A (en) | Optical fiber distributed disturbance and video linkage long-distance circumference security monitoring system | |
| CN103780883A (en) | All-fiber perimeter security monitoring equipment capable of being in linkage with video | |
| CN101684891B (en) | Stress wave and optical fiber sensing compound pipeline safety pre-warning system | |
| CN207440969U (en) | Outer break of constructing under power transmission line route warns monitoring device | |
| CN201273456Y (en) | Stress wave and optical fiber sensing compound pipe security early-warning system | |
| CN2407408Y (en) | Electronic theftproof alarm | |
| CN2864834Y (en) | Cable anti-theft and alarming device | |
| CN112525329B (en) | Double-parameter slope monitoring system based on distributed optical fiber sensing | |
| CN204423562U (en) | A kind of power cable nurse monitoring burglar alarm | |
| CN202363032U (en) | Intelligent stake | |
| CN202662108U (en) | Anti-theft device of mobile base station based on vibration sensors, infrared and sound monitoring | |
| CN210129269U (en) | Road construction safety zone anti-intrusion early warning system | |
| CN208172942U (en) | A kind of tension type anti-theft fence detector system | |
| CN202690133U (en) | Oil-well monitoring system | |
| CN110838218A (en) | Intelligent warning protection system for high-voltage overhead electric wire | |
| CN211237053U (en) | Power cable prevents destroying early warning system | |
| CN206147875U (en) | High voltage transmission lines external damage intelligence prevention and control system | |
| CN112070999B (en) | Underground pipe network protection warning board and vibration signal identification method thereof | |
| CN110379103A (en) | The method for preventing bridge security monitoring device stolen | |
| CN2503490Y (en) | Automatic alarm electric meter with electronic system for avoiding electric burglary | |
| CN207069688U (en) | A kind of solar electric power burglar alarm | |
| CN207302266U (en) | The burglar alarm of bridge security monitoring device | |
| CN207443035U (en) | Audio monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Shougang Co., Ltd. Assignor: Capital Iron & Steel General Company Contract fulfillment period: In September 29, 2009, 7 years, the patent expires Contract record no.: 200210042 Denomination of utility model: Electronic anti-theft alarm device Granted publication date: 20001122 License type: Pai Ta Record date: 2002.6.3 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.9.29, 7 YEARS, EXPIRATION OF PATENT RIGHT Name of requester: BEIJING SHOUDU STEEL CO., LTD. Effective date: 20020603 |
|
| 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 |