CN204270448U - A kind of simple type anti-theft warning circuit - Google Patents
A kind of simple type anti-theft warning circuit Download PDFInfo
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- CN204270448U CN204270448U CN201420702335.3U CN201420702335U CN204270448U CN 204270448 U CN204270448 U CN 204270448U CN 201420702335 U CN201420702335 U CN 201420702335U CN 204270448 U CN204270448 U CN 204270448U
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Abstract
The utility model discloses a kind of simple type anti-theft warning circuit, solve burglar alarm and there is circuit structure complexity, problem that cost is high.Warning circuit of the present utility model comprises the IC chip connecting power supply VCC, the photoresistance R1, the diode D1 that are connected with this IC chip respectively, diode D2, resistance R4, PNP triode VT, be connected with diode D1 and met the electric capacity C1 of power supply VCC by resistance R3, the electric capacity C2 be connected with diode D2, be connected in the discharge resistance R5 on electric capacity C1 with resistance R4 simultaneously in parallel, and be connected with PNP triode VT and meet the hummer H of power supply VCC; Described photoresistance R1 meets power supply VCC.The utility model structure is simple, easy to use, while providing automatic alarm, reduces power consumption well.
Description
Technical field
The utility model belongs to application electric technology field, is specifically related to a kind of simple type anti-theft warning circuit.
Background technology
Current, the antitheft consciousness of people is more and more higher, and burglar alarm is on the market also of all kinds, such as infrared induction alarm, temperature sense alarm etc.But, these alarms existing, its most control circuit is all comparatively complicated, energy consumption is high, and thus cost is not cheap yet, once break down, also bad maintenance.Therefore, need existing alarm, especially the structure of the control circuit of the inside is improved.
Utility model content
The purpose of this utility model is to provide a kind of simple type anti-theft warning circuit, mainly solves existing burglar alarm and there is circuit structure complexity, problem that cost is high.
To achieve these goals, the technical solution adopted in the utility model is as follows: a kind of simple type anti-theft warning circuit, specifically comprise IC chip that model is CD4011, photoresistance R1, diode D1, diode D2, electric capacity C1, electric capacity C2, resistance R3, resistance R4, discharge resistance R5, resistance R6, PNP triode VT and hummer H, wherein:
Described photoresistance R1 mono-termination 5V power supply VCC, the pin 2 of another termination IC chip;
Described electric capacity C1 positive pole connects the pin 3 of IC chip by diode D1, and meets power supply VCC by resistance R3, this electric capacity C1 negative pole then ground connection GND;
Described electric capacity C2 positive pole connects the pin 10 of IC chip by diode D2, minus earth GND;
Described resistance R4 and discharge resistance R5 is connected in parallel on electric capacity C2 positive pole, and this resistance R4 is also connected with the pin 12 of IC chip;
Described PNP triode VT emitter meets power supply VCC by hummer H, and base stage connects the pin 11, grounded collector GND of IC chip by resistance R6;
Described IC chip pin 1 connects pin 2, and pin 4 connects pin 8 and pin 9 simultaneously, and pin 5 is all connected with resistance R3 with pin 6, and pin 13 connects pin 12, and pin 14 meets power supply VCC, pin 2 and pin 7 all ground connection GND.
Further, described IC chip pin 2 is by pull down resistor R2 ground connection.
Again further, the model of described diode D1 and diode D2 is IN4148.
Further, the model of described PNP triode VT is 9015.
Compared with prior art, anti-theft warning circuit of the present utility model has following beneficial effect:
(1) structure of the present utility model is simple, reasonable in design, easy to use.
(2) the utility model adopts CD4011 as IC chip, because its fan-out capability is mA level, thus can drive triode operation well, then drives hummer work; Simultaneously, again because this kind of IC chip is non-gate logic chip, when there is input high level, output low level, during input low level, export the feature of high level, therefore it is when coordinating with photoresistance R1, diode D1, D2 and electric capacity C1, C2, can realize triggering buzzer warning, and control its duration of reporting to the police.Not only achieve the object of automatic alarm thus well, and due to IC chip power-consumption little, thus also reach the effect reducing warning circuit power consumption.
(3) the utility model is also provided with pull down resistor, can realize dividing potential drop, and is drawn to ground by the level of IC chip, avoids IC chip to be subject to external interference, thus increases the stability of circuit further.
(4) the utility model preferably adopts model to be the diode of IN4148 and model is the triode of 9015, the conducting required time of circuit can be made further to shorten, guarantee the rapid operation of hummer, and accurately control warning duration, also can coordinate with IC chip better simultaneously, the miniwatt realizing IC chip drives, the power consumption of the low warning circuit of a step-down of going forward side by side.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the utility model provides a kind of simple type anti-theft warning circuit, it comprises IC chip that model is CD4011, photoresistance R1, pull down resistor R2, electric capacity C1, electric capacity C2, resistance R3, resistance R4, discharge resistance R5, resistance R6, hummer H, model are IN4148 diode D1 and diode D2, and model is the PNP triode VT of 9015, wherein:
Described photoresistance R1 mono-termination 5V power supply VCC, the pin 2 of another termination IC chip;
Described electric capacity C1 positive pole connects the pin 3 of IC chip by diode D1, and meets power supply VCC by resistance R3, this electric capacity C1 negative pole then ground connection GND;
Described electric capacity C2 positive pole connects the pin 10 of IC chip by diode D2, minus earth GND;
Described resistance R4 and discharge resistance R5 is connected in parallel on electric capacity C2 positive pole, and this resistance R4 is also connected with the pin 12 of IC chip;
Described PNP triode VT emitter meets power supply VCC by hummer H, and base stage connects the pin 11, grounded collector GND of IC chip by resistance R6;
Described IC chip pin 1 connects pin 2, and pin 4 connects pin 8 and pin 9 simultaneously, and pin 5 is all connected with resistance R3 with pin 6, and pin 13 connects pin 12, and pin 14 meets power supply VCC, and pin 2 is by pull down resistor R2 ground connection GND, the direct ground connection GND of pin 7.
Main working process of the present utility model is as follows:
Utilize generating laser to continue to the utility model Emission Lasers light beam, the directivity of laser is fabulous, and in the air all the time as a straight line, not easily disperse, light intensity also can ensure.Due to the sensitive component that photoresistance R1 is whole warning circuit, therefore, when not having laser to irradiate, this photoresistance R1 can be high-impedance state, and now, the pin 3 of IC chip exports high level, and diode D1 oppositely ends, and makes electric capacity C1 continue charging.
When after the threshold voltage of the voltage on electric capacity C1 higher than IC chip not gate, export and just overturn, pin 10 at IC chip after not gate is anti-phase exports high level, and charges until it is identical with supply voltage to electric capacity C2 through diode D2, and photoresistance now just can be made to receive laser.The pin 10 of IC chip becomes low level, because diode has the characteristic that forward resistance is little, back resistance is large, the thus existence of diode D2, makes electric capacity C2 be difficult to be discharged by diode D2, only have and discharged by discharge resistance R5, and this discharge time is exactly the time of reporting to the police.High level on electric capacity C2 is input to the pin 12,13 of IC chip through resistance R4, after anti-phase, send low level from pin 11, then drive PNP triode VT conducting, start hummer H work, realize reporting to the police, time of fire alarming is the time that electric capacity C2 is discharged by discharge resistance R5.
In said process, when charging to electric capacity C1, if there is laser to be constantly irradiated on photoresistance R1, it is made to be low resistive state, voltage now on electric capacity C1 will be continued to bleed off by diode D1, cause the voltage of electric capacity C1 not reach the threshold voltage of IC chip not gate always, therefore can not report to the police.In the operational process of whole circuit, the irradiation of laser beam is as being both WatchDog Timer " feeding dog program ", as long as constantly there is laser to irradiate, the voltage on electric capacity C1 is just always high not to get up.And if have people to block laser, then warning circuit will be triggered because not receiving laser warning.
Above-described embodiment is only preferred embodiment of the present utility model; it is not the restriction to the utility model protection domain; in every case design concept of the present utility model being adopted, and the change carried out non-creativeness work on this basis and make, all should belong within protection domain of the present utility model.
Claims (4)
1. a simple type anti-theft warning circuit, it is characterized in that: comprise IC chip that model is CD4011, photoresistance R1, diode D1, diode D2, electric capacity C1, electric capacity C2, resistance R3, resistance R4, discharge resistance R5, resistance R6, PNP triode VT and hummer H, wherein:
Described photoresistance R1 mono-termination 5V power supply VCC, the pin 2 of another termination IC chip;
Described electric capacity C1 positive pole connects the pin 3 of IC chip by diode D1, and meets power supply VCC by resistance R3, this electric capacity C1 negative pole then ground connection GND;
Described electric capacity C2 positive pole connects the pin 10 of IC chip by diode D2, minus earth;
Described resistance R4 and discharge resistance R5 is connected in parallel on electric capacity C2 positive pole, and this resistance R4 is also connected with the pin 12 of IC chip;
Described PNP triode VT emitter meets power supply VCC by hummer H, and base stage connects the pin 11 of IC chip by resistance R6, grounded collector;
Described IC chip pin 1 connects pin 2, and pin 4 connects pin 8 and pin 9 simultaneously, and pin 5 is all connected with resistance R3 with pin 6, and pin 13 connects pin 12, and pin 14 meets power supply VCC, pin 2 and pin 7 all ground connection.
2. a kind of simple type anti-theft warning circuit according to claim 1, is characterized in that: described IC chip pin 2 is by pull down resistor R2 ground connection.
3. a kind of simple type anti-theft warning circuit according to claim 2, is characterized in that: the model of described diode D1 and diode D2 is IN4148.
4. a kind of simple type anti-theft warning circuit according to Claims 2 or 3, is characterized in that: the model of described PNP triode VT is 9015.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420702335.3U CN204270448U (en) | 2014-11-20 | 2014-11-20 | A kind of simple type anti-theft warning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420702335.3U CN204270448U (en) | 2014-11-20 | 2014-11-20 | A kind of simple type anti-theft warning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204270448U true CN204270448U (en) | 2015-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420702335.3U Expired - Fee Related CN204270448U (en) | 2014-11-20 | 2014-11-20 | A kind of simple type anti-theft warning circuit |
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| Country | Link |
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| CN (1) | CN204270448U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108280978A (en) * | 2017-01-06 | 2018-07-13 | 长沙乐昌林电子科技有限公司 | A kind of photoelectric alarm design |
-
2014
- 2014-11-20 CN CN201420702335.3U patent/CN204270448U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108280978A (en) * | 2017-01-06 | 2018-07-13 | 长沙乐昌林电子科技有限公司 | A kind of photoelectric alarm design |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150415 Termination date: 20201120 |