CN102477818A - Door lock alarm device - Google Patents
Door lock alarm device Download PDFInfo
- Publication number
- CN102477818A CN102477818A CN2010105558567A CN201010555856A CN102477818A CN 102477818 A CN102477818 A CN 102477818A CN 2010105558567 A CN2010105558567 A CN 2010105558567A CN 201010555856 A CN201010555856 A CN 201010555856A CN 102477818 A CN102477818 A CN 102477818A
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- door
- voltage
- lock
- capacitor
- voltage comparator
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Abstract
The invention relate to a door lock alarm device consisting of a sensing delay circuit and an alarm circuit. When a householder opens a door with a key or a thief opens the door with a skeleton key or picks a lock, two transistors break over by the clutter of a human body, a capacitor is charged by a power supply through a resistance, and the voltage of the capacitor is gradually close to a reference voltage of an inverting terminal of a voltage comparator at the moment; the time of opening the door for the householder is shorter, the voltage of the capacitor does not reach the reference voltage of the inverting terminal of the voltage comparator, and the charging of the capacitor is interrupted because the householder leaves a lock cylinder, so the door lock alarm device does not give an alarm; and the time of opening the door with the skeleton key or picking the lock for the thieve is longer, accordingly, when the door is unopened by the thieve, the voltage of the capacitor reaches the reference voltage of the inverting terminal of the voltage comparator, the voltage comparator outputs high level at the moment, and a one-way silicon controlled rectifier breaks over, so that a buzzer gives a continuous alarm because the current flows through the buzzer.
Description
Affiliated technical field
The present invention relates to a kind of alarm apparatus, specifically relate to a kind of door lock warning device.
Background technology
At present family's gate lock seldom has warning device, this make desire open the door with master key or the picking lock person in flagrant delict because of there not being alarm bell sound to become unbridled.
Summary of the invention
The purpose of this invention is to provide a kind of door lock warning device, its can open the door with master key or send chimes of doom during picking lock the robber, for achieving the above object; The technical solution adopted for the present invention to solve the technical problems is: form a door lock warning device by an induction delay circuit and a warning circuit; In the induction delay circuit, contain two triodes, a resistance that is used to charge and an electric capacity, described two triodes are formed a compound transistor; It connects method: the base stage of a triode links to each other with the lock core of door lock; Its emitter stage is connected with another transistor base, and the emitter stage of another triode is connected with an end of described resistance, and the colelctor electrode of two triodes is connected with power supply; The other end of described resistance is connected with the positive pole of described electric capacity, and the negative pole of electric capacity is connected with ground wire.
In warning circuit, contain a voltage comparator, two resistance that are used for reference voltage, an one-way SCR; A buzzer; Also contain a power switch, the in-phase end of described voltage comparator is connected with the positive pole of the electric capacity of induction in the delay circuit, and its end of oppisite phase links to each other with junction between two resistance that are used for reference voltage; And two resistance string that are used for reference voltage are connected between power supply and the ground wire; Described voltage comparator output is connected with the one-way SCR trigger end, and described one-way SCR anode is connected with power supply through buzzer, and described one-way SCR negative electrode is connected with ground wire.
Operating principle of the present invention is such: when owner turns the key in the lock or the robber opens the door with master key or during picking lock, the clutter of human body makes two triode conductings, power supply charges to electric capacity through resistance; Voltage on the electric capacity is progressively near the reference voltage of voltage comparator end of oppisite phase, because the time ratio that owner turns the key in the lock is shorter, when the voltage on the electric capacity is not charged to the reference voltage of voltage comparator end of oppisite phase this moment; The people has been interrupted the charging to electric capacity because of leaving lock core; So the door lock warning device is not reported to the police, and the robber opens the door with master key or during picking lock the used time long, when the bandit does not open; Voltage on the electric capacity promptly is charged to the reference voltage of voltage comparator end of oppisite phase; The high level of voltage comparator output this moment, the one-way SCR conducting, buzzer sends the chimes of doom that yowl is not put out because of there being electric current to flow through; Only turn off power switch and could remove chimes of doom
Effect of the present invention is: warning acoustic energy causes that neighbour neighbours' attention can draw back robber's larceny effectively with fear,
Description of drawings
Accompanying drawing is a circuit connection diagram of the present invention
Show induction delay circuit 1 in the drawings, lock core 2, triode 3,4, resistance 5,7,9, electric capacity 6, voltage comparator 8, warning circuit 10, power switch 11, buzzer 12, the annexation of one-way SCR 13.
The specific embodiment
To specifically narrate embodiment of the present invention with reference to accompanying drawing: form a door lock warning device by an induction delay circuit 1 and a warning circuit 10; In induction delay circuit 1, contain 3,4, one resistance that are used to charge 5 of two triodes and compound transistor of 6, two triodes of an electric capacity, 3,4 compositions; It connects method: the base stage of triode 3 links to each other with the lock core of door lock 2; Its emitter stage is connected with triode 4 base stages, and the emitter stage of triode 4 is connected with an end of resistance 5, and the colelctor electrode of two triodes 3,4 is connected with power supply; The other end of resistance 5 is connected with the positive pole of electric capacity 6, and the negative pole of electric capacity 6 is connected with ground wire.
In warning circuit 10, contain 7,9, one one-way SCRs 13 of resistance that 8, two of voltage comparators are used for reference voltage; A buzzer 12; Also contain a power switch 11, the in-phase end of voltage comparator 8 is connected with the positive pole of electric capacity 6, and its end of oppisite phase and two resistance 7, the junction between 9 link to each other; And two resistance 7,9 are serially connected between power supply and the ground wire; The output of voltage comparator 8 is connected with the trigger end of one-way SCR 13, and the anode of one-way SCR 13 is connected with power supply through buzzer 12, and the negative electrode of one-way SCR 13 is connected with ground wire.
Claims (2)
1. a door lock warning device is made up of an induction delay circuit 1 and a warning circuit 10, it is characterized in that: in induction delay circuit 1, contain 3,4, one resistance that are used to charge 5 of two triodes and an electric capacity 6.
2. the base stage according to claims 1 described triode 3 links to each other with the lock core 2 of door lock; Its emitter stage is connected with triode 4 base stages; The emitter stage of triode 4 is connected with an end of resistance 5; And the colelctor electrode of two triodes 3,4 is connected with power supply, and the other end of resistance 5 is connected with the positive pole of electric capacity 6, and the negative pole of electric capacity 6 is connected with ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105558567A CN102477818A (en) | 2010-11-22 | 2010-11-22 | Door lock alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105558567A CN102477818A (en) | 2010-11-22 | 2010-11-22 | Door lock alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102477818A true CN102477818A (en) | 2012-05-30 |
Family
ID=46090587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105558567A Pending CN102477818A (en) | 2010-11-22 | 2010-11-22 | Door lock alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102477818A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113830025A (en) * | 2021-11-25 | 2021-12-24 | 南京智鹤电子科技有限公司 | Logistics vehicle anti-theft alarm system based on Internet and use method thereof |
-
2010
- 2010-11-22 CN CN2010105558567A patent/CN102477818A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113830025A (en) * | 2021-11-25 | 2021-12-24 | 南京智鹤电子科技有限公司 | Logistics vehicle anti-theft alarm system based on Internet and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120530 |