CN103473879B - Mute circuit for photoelectric smoke alarm - Google Patents
Mute circuit for photoelectric smoke alarm Download PDFInfo
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- CN103473879B CN103473879B CN201310426024.9A CN201310426024A CN103473879B CN 103473879 B CN103473879 B CN 103473879B CN 201310426024 A CN201310426024 A CN 201310426024A CN 103473879 B CN103473879 B CN 103473879B
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Abstract
The invention discloses a mute circuit for a photoelectric smoke alarm. The mute circuit comprises a capacitor, a testing key, a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode, a second triode and a diode, wherein a positive electrode of the capacitor, the testing key, the first resistor, the second resistor and the collector electrode of the first triode are connected with one another in sequence, the base electrode of the first triode is connected with the positive electrode of the capacitor through the third resistor, the base electrode of the first triode is connected with the negative electrode of the capacitor through the fourth resistor, the emitting electrode of the first triode is connected with the ground, the base electrode of the second triode is connected with the connecting ends of the first resistor and the second resistor, the emitting electrode of the second triode is connected with the positive electrode of a 9V power supply, and the collector electrode of the second triode is connected with the positive electrode of the diode. The improvement and optimization of peripheral circuits are adopted, the mute circuit is applied to the photoelectric smoke alarm, therefore, the muting function can be well achieved, and the requirements of clients are met.
Description
Technical field
The present invention relates to integrated circuit fields, particularly relate to a kind of mute circuit for photoelectric smoke fog siren.
Technical background
Due to indoor occupant activity such as oil smoke during cooking, to smoke temporarily, smoke alarm can be reported to the police, and this just needs HUSH(quiet) function, make the sensitivity reducing alarm within a period of time, make to report to the police and suspend.
Current general photoelectric smoke fog siren circuit does not provide this function, needs special integrated circuit to realize this application, so just causes user to need to purchase chip specially to realize this function, add expense and the cost of buying.
Refer to Fig. 1, the photoelectric smoke fog siren integrated circuit being MC146010 for the model of Motorola Inc., this photoelectric smoke fog siren integrated circuit can realize mute function, an optics labyrinth and flue is had in photoelectric smoke fog siren, infrared tube and infrared receiving tube are installed receive and infrared transmitting tube, time smokeless, infrared receiving tube can not receive the infrared light that infrared transmitting tube sends, when flue dust enters flue, by refraction, reflection, infrared receiving tube receives the infrared light that infrared transmitting tube sends, whether intelligent alarm circuit judges exceedes setting threshold value, give the alarm if exceeded.
Refer to Fig. 2, model is the physical circuit realizing mute function in the photoelectric smoke fog siren integrated circuit of MC146010, comprise resistance R1 ', resistance R2 ', the positive pole of electric capacity C1 ', feeler switch SW1 and quiet key SW2,9V power supply, resistance R1 ', resistance R2 ' and electric capacity C1 ' to connect successively; Electric capacity C1 ' while ground connection; One end contact resistance R1 ' of quiet key SW2 and the end that connects of resistance R2 '; The other end of quiet key SW2 connects the pin P16 of photoelectric smoke fog siren circuit; One end of feeler switch SW1 connects the positive pole of 9V power supply, and the other end of feeler switch SW1 connects the pin P16 of photoelectric smoke fog siren circuit.The resistance of resistance R1 ' is 10M Ω, the resistance of resistance R2 ' is 4.7M Ω, electric capacity C1 ' is 0.47uF, and the resistance value of resistance R1 ' and resistance R2 ' can adjust according to the situation of reality, and then determines the length of actual mute time.
The point of MC146010 is if network use, and at I/O termination one 33uF filter capacitor, then device can not enter the HUSH state of default 10 minutes.Reason is after this locality has cigarette to report to the police, the 33uF capacitor charging of I/O end is to VDD=0.7V, now press quiet key SW2, though device can be made to enter HUSH state, but the electric charge on 33uF electric capacity is within 128 to the 256T time, have little time to manage (MOS (metal-oxide-semiconductor) transistor) by the pull-down nmos of device inside to give out light, so be considered to remote-end alarm, thus terminate HUSH state.
Summary of the invention
The object of the invention is to the defect overcoming prior art, and a kind of mute circuit for photoelectric smoke fog siren is provided, by adopting improvement and the optimization of peripheral circuit, be applied in photoelectric smoke fog siren, can well HUSH(be realized quiet) function, meet the requirement of client.
The technical scheme realizing above-mentioned purpose is: a kind of mute circuit for photoelectric smoke fog siren, external 9V power supply and sensor, described mute circuit comprises electric capacity, feeler switch, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode and diode, and described first resistance, the 3rd resistance and the 4th resistance are high-ohmic resistor, wherein:
The positive pole of described electric capacity, feeler switch, the first resistance, the second resistance are connected successively with the collector of the first triode;
Described feeler switch is connected the positive pole of described 9V power supply with the end that connects of the first resistance;
The base stage of described first triode connects the positive pole of described electric capacity by described 3rd resistance, the base stage of described first triode connects the negative pole of described electric capacity by described 4th resistance, and the end ground connection that connects of the base stage of described first triode and the 4th resistance, the grounded emitter of described first triode;
The base stage of described second triode connects the end that connects of described first resistance and the second resistance, and the emitter of described second triode connects the positive pole of described 9V power supply, and the collector of described second triode connects the positive pole of described diode;
The negative pole of described diode connects described sensor.
The above-mentioned mute circuit for photoelectric smoke fog siren, wherein, the span of the first described resistance is 1M Ω to 2M Ω.
The above-mentioned mute circuit for photoelectric smoke fog siren, wherein, the span of described electric capacity is 100uF to 150uF.
The above-mentioned mute circuit for photoelectric smoke fog siren, wherein, described first triode is NPN type triode, and described second triode is PNP type triode.
Compared with prior art, the beneficial effect of a kind of mute circuit for photoelectric smoke fog siren of the present invention is: mute circuit of the present invention may be used in current photoelectric smoke fog siren, this circuit structure is simple, practical, control method is simple, realize the mute function of photoelectric smoke fog siren without the need to outsourcing chip, save buying expenses and cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of MC146010 circuit;
Fig. 2 is the circuit diagram of mute circuit in MC146010 circuit;
Fig. 3 is the circuit diagram of the mute circuit for photoelectric smoke fog siren of the present invention;
Fig. 4 is the schematic diagram of the embodiment of an application of the present invention.
Embodiment
In order to understand technical scheme of the present invention better, be also described in detail by reference to the accompanying drawings below by specific embodiment.
Refer to Fig. 3, a kind of mute circuit for photoelectric smoke fog siren of the present invention, external 9V power supply and sensor, mute circuit comprises electric capacity C, feeler switch K, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first triode Q1, the second triode Q2 and diode D.First resistance R1, the 3rd resistance R3 and the 4th resistance R4 are high-ohmic resistor.
The positive pole of electric capacity C, feeler switch K, the first resistance R1, the second resistance R2 are connected successively with the collector of the first triode Q1; Feeler switch K is connected the positive pole of 9V power supply with the end that connects of the first resistance R1; The base stage of the first triode Q1 connects the positive pole of electric capacity C by the 3rd resistance R3, the base stage of the first triode Q1 connects the negative pole of electric capacity C by the 4th resistance R4, and the end ground connection that connects of the base stage of the first triode Q1 and the 4th resistance R4, the grounded emitter of the first triode Q1; The base stage of the second triode Q2 connects the end that connects of the first resistance R1 and the second resistance R2, and the emitter of the second triode Q2 connects the positive pole of 9V power supply, and the collector of the second triode Q2 connects the positive pole of diode D; The negative pole connecting sensor of diode D.Preferably, the first triode Q1 is NPN type triode, and the second triode Q2 is PNP type triode; The span of the first resistance R1 is 1M Ω to 2M Ω; The span of electric capacity is 100uF to 150uF.
Principle of work of the present invention is as follows: click feeler switch K, electric capacity C14 is charged to supply voltage VDD, then slowly discharged by the first resistance R1, the 3rd resistance R3 and the 4th resistance R4, period second triode Q2 saturation conduction, make the LED of sensor bright, reach the object of reporting to the police and stopping, when the voltage drop of electric capacity C is to when being not enough to the Q2 conducting of maintenance second triode, the sensitivity of photoelectric mist alarm is replied normal, and the LED of sensor does not dodge recovery normal condition.
Get different values for electric capacity C, the first resistance R1, the 3rd resistance R3 and the 4th resistance R4, mute time is different, as shown in the table:
| C | R1 | R3 | R4 | Mute time |
| 100uF | 1.5MΩ | 1.5MΩ | 1.5MΩ | 10 minutes |
| 100uF | 1.5MΩ | 2MΩ | 1.5MΩ | 8 minutes |
| 100uF | 1.5MΩ | 1.5MΩ | 1.5MΩ | 14 minutes |
First resistance R1 can change the degree of sensitivity decrease, and the general range of the first resistance R1 is 1M Ω to 2M Ω: as the first resistance R1=1M Ω, sensitivity is minimum; Along with the increase of the resistance of the first resistance R1, sensitivity increases.
The general 100uF of electric capacity C can ensure enough duration of charging, can consider to increase to about 150uF.But electric capacity too conference causes voltage drop slowly, and the quiet time is oversize; 3rd resistance R3 and the 4th resistance R4 is a pair combination, can combine, this change in megohm rank, and the time quiet each time can be made not necessarily identical
Refer to Fig. 4, Fig. 4 is the schematic diagram that the present invention is applied to photoelectric smoke fog siren, in figure, mute circuit of the present invention and photoelectric smoke fog siren integrated circuit with the use of, the 9V power supply of the external photoelectric smoke fog siren of mute circuit and the sensor of photoelectric smoke fog siren.In the present embodiment, this smoke alarm integrated circuit adopts model to be BL59A12.
In sum, mute circuit of the present invention may be used in current photoelectric smoke fog siren, and this circuit structure is simple, practical, control method is simple, realizes the mute function of photoelectric smoke fog siren, saved buying expenses and cost without the need to outsourcing chip.
Below embodiment is to invention has been detailed description by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.
Claims (4)
1. the mute circuit for photoelectric smoke fog siren, external 9V power supply and sensor, it is characterized in that, described mute circuit comprises electric capacity, feeler switch, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode and diode, and described first resistance, the 3rd resistance and the 4th resistance are high-ohmic resistor, wherein:
The positive pole of described electric capacity, feeler switch, the first resistance, the second resistance are connected successively with the collector of the first triode;
Described feeler switch is connected the positive pole of described 9V power supply with the end that connects of the first resistance;
The base stage of described first triode connects the positive pole of described electric capacity by described 3rd resistance, the base stage of described first triode connects the negative pole of described electric capacity by described 4th resistance, and end connection the 3rd resistance that connects of the base stage of described first triode and the 4th resistance, the grounded emitter of described first triode;
The base stage of described second triode connects the end that connects of described first resistance and the second resistance, and the emitter of described second triode connects the positive pole of described 9V power supply, and the collector of described second triode connects the positive pole of described diode;
The negative pole of described diode connects described sensor.
2. the mute circuit for photoelectric smoke fog siren according to claim 1, is characterized in that, the span of the first described resistance is 1M Ω to 2M Ω.
3. the mute circuit for photoelectric smoke fog siren according to claim 1, is characterized in that, the span of described electric capacity is 100uF to 150uF.
4. the mute circuit for photoelectric smoke fog siren according to claim 1, is characterized in that, described first triode is NPN type triode, and described second triode is PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310426024.9A CN103473879B (en) | 2013-09-18 | 2013-09-18 | Mute circuit for photoelectric smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310426024.9A CN103473879B (en) | 2013-09-18 | 2013-09-18 | Mute circuit for photoelectric smoke alarm |
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| CN103473879A CN103473879A (en) | 2013-12-25 |
| CN103473879B true CN103473879B (en) | 2015-06-10 |
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| CN201310426024.9A Active CN103473879B (en) | 2013-09-18 | 2013-09-18 | Mute circuit for photoelectric smoke alarm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106970563B (en) * | 2017-04-12 | 2019-03-15 | 安徽鼎梁生物能源科技开发有限公司 | A kind of biomass granulation machine remote monitoring system |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4313110A (en) * | 1980-02-19 | 1982-01-26 | Thomas Subulak | Smoke alarm having temporary disabling features |
| US4814748A (en) * | 1987-11-09 | 1989-03-21 | Southwest Laboratories, Inc. | Temporary desensitization technique for smoke alarms |
| US5093651A (en) * | 1990-10-11 | 1992-03-03 | Thomas Edward M | Intelligent smoke detector |
| US5422629A (en) * | 1992-03-30 | 1995-06-06 | Brk Brands, Inc. | Alarm silencing circuitry for photoelectric smoke detectors |
| US6753786B1 (en) * | 2000-08-11 | 2004-06-22 | Walter Kidde Portable Equipment, Inc. | Microprocessor-based combination smoke and carbon monoxide detector having intelligent hush feature |
| US6762688B2 (en) * | 2001-02-16 | 2004-07-13 | Brk Brands, Inc. | Device with silencing circuitry |
| US6642849B1 (en) * | 2001-12-11 | 2003-11-04 | Maple Chase Company | Hush disable feature for photoelectric smoke alarm |
| IES20070677A2 (en) * | 2006-09-28 | 2008-04-30 | E I Technology Ltd | Control of alarm devices |
| CN101520935B (en) * | 2009-04-02 | 2010-12-08 | 上海贝岭股份有限公司 | Mute circuit for ion type smog alarm |
| US20110057806A1 (en) * | 2009-09-09 | 2011-03-10 | Universal Security Instruments, Inc | Hazardous Condition Detector with Hardware Hush |
| DE102009060418A1 (en) * | 2009-12-22 | 2011-06-30 | Minimax GmbH & Co. KG, 23843 | Test device for hazard alarm systems |
| CN203433626U (en) * | 2013-09-18 | 2014-02-12 | 上海贝岭股份有限公司 | Mute circuit applied to photoelectric smoke alarm |
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