CN103927844A - Fire alarm circuit - Google Patents
Fire alarm circuit Download PDFInfo
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- CN103927844A CN103927844A CN201410126654.9A CN201410126654A CN103927844A CN 103927844 A CN103927844 A CN 103927844A CN 201410126654 A CN201410126654 A CN 201410126654A CN 103927844 A CN103927844 A CN 103927844A
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- resistor
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- gas sensor
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Abstract
The invention relates to an alarm circuit, in particular to a fire alarm circuit. The fire alarm circuit comprises a battery GB, a power switch S, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a filter capacitor C1, a voltage stabilizing diode VS, a gas sensor, a potentiometer RP, a diode VD, a capacitor C2, a transistor V, a TWH8778 type power electronic switch integrated circuit IC and a high-loudness alarm BL with a sound source. One end of the gas sensor is connected with the positive electrode of the battery GB sequentially through the resistor R2, the resistor R1 and the power switch S, and the other end of the gas sensor is connected with the negative electrode of the battery GB. The fire alarm circuit can give out alarm sound in time when detecting smoke, and therefore a fire can be extinguished as soon as possible. The fire alarm circuit can be used for a family and public places such as a department dormitory, an office building, a movie theater and a dancing hall, is flexible to arrange and easy and quick to use.
Description
Technical field
The present invention relates to relate to alarm circuit, particularly relate to a kind of fire-alarm circuit.
Background technology
China is a populous nation, and smoker's quantity is relatively also special many, so that no smoking is in public necessary, but current ban on opium-smoking and the opium trade and prohibit fiery mode just by listing or artificially supervising, and poor effect and lavishing labor on.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of fire-alarm circuit that can automatically detect smog is provided.
For solving the problems of the technologies described above, technical scheme that the present invention adopts is: a kind of fire-alarm circuit, it comprises battery GB, power switch S, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, filter capacitor C1, voltage stabilizing diode VS, gas sensor, potentiometer RP, diode VD, capacitor C2, transistor V, TWH8778 type power electronic switching integrated circuit (IC) and the high loudness alarm BL that carries source of sound, one end of described gas sensor is successively by resistance R 2, resistance R 1 is connected battery GB positive pole with power switch S, the other end connects battery GB negative pole, the A utmost point of gas sensor is connected battery GB positive pole by resistance R 1 and also connects the negative pole of battery GB by filter capacitor C1 with power switch S, the B utmost point of gas sensor connects a wherein resistor wiring end of potentiometer RP by resistance R 3, the cathode terminal of voltage stabilizing diode VS connects the A utmost point of gas sensor, and anode tap connects the negative pole of battery GB, the anode tap of diode VD connects another resistor wiring end of potentiometer RP, and cathode terminal connects the negative pole of battery GB, the collector of transistor V connects the positive pole of battery GB by power switch S, the emitter of transistor V is connected the negative pole of battery GB successively with resistance R 5 by resistance R 4, 1 pin of TWH8778 type power electronic switching integrated circuit (IC) connects battery GB positive pole by power switch S, 4 pin connect the negative pole of battery GB and are connected successively the emitter of transistor V by resistance R 5 with resistance R 4, and 5 pin are connected the emitter of transistor V and connected 4 pin by resistance R 5 by resistance R 4, one end of capacitor C2 connects the slide terminals of potentiometer RP, and the other end connects 4 pin of TWH8778 type power electronic switching integrated circuit (IC), one end of high loudness alarm BL connects 2 pin and 3 pin of TWH8778 type power electronic switching integrated circuit (IC), and the other end connects the negative pole of battery GB.
Described battery GB, power switch S, resistor R1, filter capacitor C1 and voltage stabilizing diode VS composition power supply stabilization circuit; Described gas sensor, resistor R1, resistor R2 composition Smoke Detection circuit, described resistor R3, resistor R4, resistor R5, potentiometer RP, diode VD, capacitor C2, transistor V and TWH8778 type power electronic switching integrated circuit (IC) composition electronic switching circuit; The described high loudness alarm BL that carries source of sound forms warning circuit.
Beneficial effect of the present invention:
(1) the present invention can send in time chimes of doom in the time smog being detected, is beneficial to stamp out a fire early;
(2) this device can be used for family, also can be used for the public places such as unit dormitory, office building, cinema, dancing hall;
(3) flexible arrangement is simple and easy quick.
Brief description of the drawings
Fig. 1 is the circuit diagram of an embodiment of the present invention
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and in conjunction with the embodiments.
With reference to figure 1, a kind of fire-alarm circuit, it comprises battery GB, power switch S, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, filter capacitor C1, voltage stabilizing diode VS, gas sensor, potentiometer RP, diode VD, capacitor C2, transistor V, TWH8778 type power electronic switching integrated circuit (IC) and carries the high loudness alarm BL of source of sound, one end of described gas sensor is connected battery GB positive pole by resistance R 2, resistance R 1 successively with power switch S, the other end connects battery GB negative pole; The A utmost point of gas sensor is connected battery GB positive pole by resistance R 1 and also connects the negative pole of battery GB by filter capacitor C1 with power switch S, the B utmost point of gas sensor connects a wherein resistor wiring end of potentiometer RP by resistance R 3; The cathode terminal of voltage stabilizing diode VS connects the A utmost point of gas sensor, and anode tap connects the negative pole of battery GB; The anode tap of diode VD connects another resistor wiring end of potentiometer RP, and cathode terminal connects the negative pole of battery GB; The collector of transistor V connects the positive pole of battery GB by power switch S, the emitter of transistor V is connected the negative pole of battery GB successively with resistance R 5 by resistance R 4; 1 pin of TWH8778 type power electronic switching integrated circuit (IC) connects battery GB positive pole by power switch S, 4 pin connect the negative pole of battery GB and are connected successively the emitter of transistor V by resistance R 5 with resistance R 4, and 5 pin are connected the emitter of transistor V and connected 4 pin by resistance R 5 by resistance R 4; One end of capacitor C2 connects the slide terminals of potentiometer RP, and the other end connects 4 pin of TWH8778 type power electronic switching integrated circuit (IC); One end of high loudness alarm BL connects 2 pin and 3 pin of TWH8778 type power electronic switching integrated circuit (IC), and the other end connects the negative pole of battery GB.
Described battery GB, power switch S, resistor R1, filter capacitor C1 and voltage stabilizing diode VS composition power supply stabilization circuit; Described gas sensor, resistor R1, resistor R2 composition Smoke Detection circuit, described resistor R3, resistor R4, resistor R5, potentiometer RP, diode VD, capacitor C2, transistor V and TWH8778 type power electronic switching integrated circuit (IC) composition electronic switching circuit; The described high loudness alarm BL that carries source of sound forms warning circuit.
Principle of work of the present invention: gas sensor is not in the time smog being detected, the conductance of its A, B two interpolars is very low, is high-impedance state, and transistor V is in cut-off state, the not conducting of electronic switch of TWH8778 type power electronic switching integrated circuit (IC) inside, not sounding of high loudness alarm BL.In the time of breaking out of fire, gas sensor detects smog, the resistance value of its A, B two interpolars diminishes, transistor V is because of base potential rising conducting, make 5 pin voltages of TWH8778 type power electronic switching integrated circuit (IC) higher than trigger value, the electronic switch conducting that it is inner, high loudness alarm BL energising work, sends loud and clear chimes of doom.
Finally, it is also to be noted that, what more than enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (2)
1. a fire-alarm circuit, comprise battery GB, power switch S, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, filter capacitor C1, voltage stabilizing diode VS, gas sensor, potentiometer RP, diode VD, capacitor C2, transistor V, TWH8778 type power electronic switching integrated circuit (IC) and carry the high loudness alarm BL of source of sound, one end of described gas sensor is connected battery GB positive pole by resistance R 2, resistance R 1 successively with power switch S, the other end connects battery GB negative pole; The A utmost point of gas sensor is connected battery GB positive pole by resistance R 1 and also connects the negative pole of battery GB by filter capacitor C1 with power switch S, the B utmost point of gas sensor connects a wherein resistor wiring end of potentiometer RP by resistance R 3; The cathode terminal of voltage stabilizing diode VS connects the A utmost point of gas sensor, and anode tap connects the negative pole of battery GB; The anode tap of diode VD connects another resistor wiring end of potentiometer RP, and cathode terminal connects the negative pole of battery GB; The collector of transistor V connects the positive pole of battery GB by power switch S, the emitter of transistor V is connected the negative pole of battery GB successively with resistance R 5 by resistance R 4; 1 pin of TWH8778 type power electronic switching integrated circuit (IC) connects battery GB positive pole by power switch S, 4 pin connect the negative pole of battery GB and are connected successively the emitter of transistor V by resistance R 5 with resistance R 4, and 5 pin are connected the emitter of transistor V and connected 4 pin by resistance R 5 by resistance R 4; One end of capacitor C2 connects the slide terminals of potentiometer RP, and the other end connects 4 pin of TWH8778 type power electronic switching integrated circuit (IC); One end of high loudness alarm BL connects 2 pin and 3 pin of TWH8778 type power electronic switching integrated circuit (IC), and the other end connects the negative pole of battery GB.
2. a kind of fire-alarm circuit according to claim 1, is characterized in that: described battery GB, power switch S, resistor R1, filter capacitor C1 and voltage stabilizing diode VS composition power supply stabilization circuit; Described gas sensor, resistor R1, resistor R2 composition Smoke Detection circuit, described resistor R3, resistor R4, resistor R5, potentiometer RP, diode VD, capacitor C2, transistor V and TWH8778 type power electronic switching integrated circuit (IC) composition electronic switching circuit; The described high loudness alarm BL that carries source of sound forms warning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410126654.9A CN103927844A (en) | 2014-03-27 | 2014-03-27 | Fire alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410126654.9A CN103927844A (en) | 2014-03-27 | 2014-03-27 | Fire alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103927844A true CN103927844A (en) | 2014-07-16 |
Family
ID=51146053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410126654.9A Pending CN103927844A (en) | 2014-03-27 | 2014-03-27 | Fire alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103927844A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766442A (en) * | 2015-04-21 | 2015-07-08 | 吴建堂 | Drunk driving warning device |
| CN107507387A (en) * | 2017-09-30 | 2017-12-22 | 覃益祥 | A kind of fire alarm circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2278897Y (en) * | 1996-06-11 | 1998-04-15 | 李克平 | Exhauster for miniature full-automatic gas water heater |
| CN201126621Y (en) * | 2007-12-17 | 2008-10-01 | 余代安 | No smoking prompter |
| CN202403306U (en) * | 2011-12-23 | 2012-08-29 | 赛强 | Electronic combustible gas leakage automatic detection and protection device |
-
2014
- 2014-03-27 CN CN201410126654.9A patent/CN103927844A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2278897Y (en) * | 1996-06-11 | 1998-04-15 | 李克平 | Exhauster for miniature full-automatic gas water heater |
| CN201126621Y (en) * | 2007-12-17 | 2008-10-01 | 余代安 | No smoking prompter |
| CN202403306U (en) * | 2011-12-23 | 2012-08-29 | 赛强 | Electronic combustible gas leakage automatic detection and protection device |
Non-Patent Citations (3)
| Title |
|---|
| 佚名: "气敏电阻器火灾报警器电路分析", 《51电子网》, 11 August 2013 (2013-08-11), pages 51 - 88581 * |
| 佚名: "火灾报警器(三)", 《EDN CHINA博客》, 31 May 2008 (2008-05-31), pages 121149 * |
| 佚名: "火灾报警器(三)", 《维库电子市场网》, 30 September 2007 (2007-09-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766442A (en) * | 2015-04-21 | 2015-07-08 | 吴建堂 | Drunk driving warning device |
| CN107507387A (en) * | 2017-09-30 | 2017-12-22 | 覃益祥 | A kind of fire alarm circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140716 |