CN204331976U - A kind of Domestic smoke alarms - Google Patents
A kind of Domestic smoke alarms Download PDFInfo
- Publication number
- CN204331976U CN204331976U CN201420745047.6U CN201420745047U CN204331976U CN 204331976 U CN204331976 U CN 204331976U CN 201420745047 U CN201420745047 U CN 201420745047U CN 204331976 U CN204331976 U CN 204331976U
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- CN
- China
- Prior art keywords
- triode
- rectifier bridge
- diode
- pole
- output terminal
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Abstract
The utility model discloses a kind of Domestic smoke alarms, comprise the transformer T1, rectifier bridge D, smoke transducer M, voltage stabilizing diode VD1, diode VD2, hummer H, the adjustable resistance RP that are electrically connected, photodiode VD3, switch S, the first triode Q1, the second triode Q2 and the 3rd triode Q3.Domestic smoke alarms of the present utility model, cost of manufacture is low, and can regulate its sensitivity, also has daybreak warning function, and circuit is simple, has a good application prospect.
Description
Technical field
The utility model relates to a kind of Domestic smoke alarms, belongs to consumer electronic products technical field.
Background technology
Smoke alarm, carry out warning by the concentration of monitoring smog and realize fire disasters protection, at present, smoke alarm on the market, sensitivity is had nothing in common with each other, but sensitivity is all fixing unalterable substantially, and smoke alarm is all for public arenas such as business offices, school, markets, price comparison is expensive, cost of manufacture is high, and the smoke alarm for family expenses is fewer, and function singleness.
Utility model content
The technical matters that the utility model solves is that sensitivity is fixed unalterable at smoke alarm on the market, and price comparison is expensive, and cost of manufacture is high, the problem of function singleness.Domestic smoke alarms of the present utility model, cost of manufacture is low, and can regulate its sensitivity, also has daybreak warning function, and circuit is simple, has a good application prospect.
To achieve the above object, the technical scheme that adopts of the utility model is as follows:
A kind of Domestic smoke alarms, it is characterized in that: comprise transformer T1, rectifier bridge D, smoke transducer M, voltage stabilizing diode VD1, diode VD2, hummer H, adjustable resistance RP, photodiode VD3, switch S, first triode Q1, second triode Q2 and the 3rd triode Q3, the external civil power of input end of described transformer T1, the output terminal of described transformer T1 is connected by the input end of rectifier bridge D, the positive output end of described rectifier bridge D is connected with the negative pole of voltage stabilizing diode VD1 by resistance R1, the positive pole of described voltage stabilizing diode VD1 is connected with the negative output terminal of described rectifier bridge D, the positive output end of described rectifier bridge D also respectively with smoke transducer M, one end of hummer H is connected, the other end of described smoke transducer M is connected with the negative output terminal of rectifier bridge D by adjustable resistance RP, the A pole of described smoke transducer M is connected with the positive output end of rectifier bridge D, the B pole of described smoke transducer M is connected with the positive pole of diode VD2, the negative pole of described diode VD2 is connected with the base stage of the first triode Q1 by current-limiting resistance R2, the collector of the base stage of described first triode Q1 is connected with the base stage of the second triode Q2, the collector of described second triode Q2 is connected with the base stage of the 3rd triode Q3, described first triode Q1 is connected with the negative output terminal of rectifier bridge D jointly with the emitter of the 3rd triode Q3, the emitter of described second triode Q2, the collector of the 3rd diode is connected with the other end of hummer H, the collector of described first triode Q1 is also connected with the negative pole of photodiode VD3, the positive pole of described photodiode VD3 is connected by the negative output terminal of switch S with rectifier bridge D, described photodiode VD3 is also connected with the positive output end of rectifier bridge D by resistance R3.
Aforesaid a kind of Domestic smoke alarms, is characterized in that: the input end of described transformer T1 is provided with fuse F.
Aforesaid a kind of Domestic smoke alarms, is characterized in that: be provided with filter capacitor C1 between the positive and negative output terminal of described rectifier bridge D.
Aforesaid a kind of Domestic smoke alarms, is characterized in that: described first triode Q1, the 3rd triode Q3 are NPN triode, and the second triode Q2 is PNP triode.
The beneficial effects of the utility model are: Domestic smoke alarms of the present utility model, Domestic smoke alarms, and cost of manufacture is low, and can regulate its sensitivity, also have daybreak warning function, and circuit is simple, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of Domestic smoke alarms of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Fig. 1, a kind of Domestic smoke alarms, comprise transformer T1, rectifier bridge D, smoke transducer M, voltage stabilizing diode VD1, diode VD2, hummer H, adjustable resistance RP, photodiode VD3, switch S, first triode Q1, second triode Q2 and the 3rd triode Q3, the external civil power of input end of transformer T1, the output terminal of transformer T1 is connected by the input end of rectifier bridge D, the positive output end of rectifier bridge D is connected with the negative pole of voltage stabilizing diode VD1 by resistance R1, the positive pole of voltage stabilizing diode VD1 is connected with the negative output terminal of rectifier bridge D, the positive output end of rectifier bridge D also respectively with smoke transducer M, one end of hummer H is connected, the other end of smoke transducer M is connected with the negative output terminal of rectifier bridge D by adjustable resistance RP, the A pole of smoke transducer M is connected with the positive output end of rectifier bridge D, the B pole of smoke transducer M is connected with the positive pole of diode VD2, the negative pole of diode VD2 is connected with the base stage of the first triode Q1 by current-limiting resistance R2, the collector of the base stage of the first triode Q1 is connected with the base stage of the second triode Q2, the collector of the second triode Q2 is connected with the base stage of the 3rd triode Q3, first triode Q1 is connected with the negative output terminal of rectifier bridge D jointly with the emitter of the 3rd triode Q3, the emitter of the second triode Q2, the collector of the 3rd diode is connected with the other end of hummer H, the collector of the first triode Q1 is also connected with the negative pole of photodiode VD3, the positive pole of photodiode VD3 is connected by the negative output terminal of switch S with rectifier bridge D, photodiode VD3 is also connected with the positive output end of rectifier bridge D by resistance R3, the input end of transformer T1 is provided with fuse F, ensure short circuit or electric current excessive time, burn out other components and parts such as transformer, rectifier bridge D just, filter capacitor C1 is provided with between negative output terminal, improve the stability that rectifier bridge D exports DC voltage.
Described first triode Q1, the 3rd triode Q3 are NPN triode, and the second triode Q2 is PNP triode.
The principle of work of Domestic smoke alarms of the present utility model is,
The course of work of smog alarm, when smoke transducer M does not contact smog, the resistance value of its A, B two interpolar is very large, at this moment diode VD2 not conducting, and triode Q1, Q2, Q3 are all ended, and hummer H does not work; When monitored district have the concentration of smog to reach certain value time, smoke transducer M A, B two the resistance of interpolar will diminish, make diode VD2 conducting, the equal saturation conduction of triode Q1, Q2, Q3, hummer H is made to send chimes of doom, achieve the requirement that harmful gas is reported to the police, simple and reliable, and, smoke transducer M is also connected with adjustable resistance RP, can regulate the sensitivity of smoke transducer M;
Daybreak function the course of work, during daytime switch S be disconnect, can close to evening, after evening, switch S closed platform, photodiode VD3 does not receive light, at this moment photodiode VD3 not conducting, and triode Q2, Q3 are all ended, and hummer H does not work; Brightened the same day or light reaches when necessarily requiring, photodiode VD3 perceptual signal makes its internal resistance diminish and conducting, makes the equal saturation conduction of triode Q2, Q3, and hummer H pronounces, and realizes the object of daybreak alarm clock.
In sum, Domestic smoke alarms of the present utility model, Domestic smoke alarms, cost of manufacture is low, and can regulate its sensitivity, also has daybreak warning function, and circuit is simple, has a good application prospect.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof
.
Claims (4)
1. a Domestic smoke alarms, it is characterized in that: comprise transformer T1, rectifier bridge D, smoke transducer M, voltage stabilizing diode VD1, diode VD2, hummer H, adjustable resistance RP, photodiode VD3, switch S, first triode Q1, second triode Q2 and the 3rd triode Q3, the external civil power of input end of described transformer T1, the output terminal of described transformer T1 is connected by the input end of rectifier bridge D, the positive output end of described rectifier bridge D is connected with the negative pole of voltage stabilizing diode VD1 by resistance R1, the positive pole of described voltage stabilizing diode VD1 is connected with the negative output terminal of described rectifier bridge D, the positive output end of described rectifier bridge D also respectively with smoke transducer M, one end of hummer H is connected, the other end of described smoke transducer M is connected with the negative output terminal of rectifier bridge D by adjustable resistance RP, the A pole of described smoke transducer M is connected with the positive output end of rectifier bridge D, the B pole of described smoke transducer M is connected with the positive pole of diode VD2, the negative pole of described diode VD2 is connected with the base stage of the first triode Q1 by current-limiting resistance R2, the collector of the base stage of described first triode Q1 is connected with the base stage of the second triode Q2, the collector of described second triode Q2 is connected with the base stage of the 3rd triode Q3, described first triode Q1 is connected with the negative output terminal of rectifier bridge D jointly with the emitter of the 3rd triode Q3, the emitter of described second triode Q2, the collector of the 3rd diode is connected with the other end of hummer H, the collector of described first triode Q1 is also connected with the negative pole of photodiode VD3, the positive pole of described photodiode VD3 is connected by the negative output terminal of switch S with rectifier bridge D, described photodiode VD3 is also connected with the positive output end of rectifier bridge D by resistance R3.
2. a kind of Domestic smoke alarms according to claim 1, is characterized in that: the input end of described transformer T1 is provided with fuse F.
3. a kind of Domestic smoke alarms according to claim 1, is characterized in that: be provided with filter capacitor C1 between the positive and negative output terminal of described rectifier bridge D.
4. a kind of Domestic smoke alarms according to claim 1, is characterized in that: described first triode Q1, the 3rd triode Q3 are NPN triode, and the second triode Q2 is PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745047.6U CN204331976U (en) | 2014-12-03 | 2014-12-03 | A kind of Domestic smoke alarms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745047.6U CN204331976U (en) | 2014-12-03 | 2014-12-03 | A kind of Domestic smoke alarms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204331976U true CN204331976U (en) | 2015-05-13 |
Family
ID=53168307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420745047.6U Expired - Fee Related CN204331976U (en) | 2014-12-03 | 2014-12-03 | A kind of Domestic smoke alarms |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204331976U (en) |
-
2014
- 2014-12-03 CN CN201420745047.6U patent/CN204331976U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20150513 Termination date: 20151203 |
|
| EXPY | Termination of patent right or utility model |