CN103473879A - Mute circuit for photoelectric smoke alarm - Google Patents
Mute circuit for photoelectric smoke alarm Download PDFInfo
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- CN103473879A CN103473879A CN2013104260249A CN201310426024A CN103473879A CN 103473879 A CN103473879 A CN 103473879A CN 2013104260249 A CN2013104260249 A CN 2013104260249A CN 201310426024 A CN201310426024 A CN 201310426024A CN 103473879 A CN103473879 A CN 103473879A
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- photoelectric smoke
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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, relate in particular to a kind of mute circuit for the photoelectric smoke fog siren.
Technical background
Due to the activity of indoor occupant oil smoke, interim smoke etc. such as cooking the time, smoke alarm can be reported to the police, and this just needs the HUSH(quiet) function, make the sensitivity that reduces alarm within a period of time, making reports to the police suspends.
Current general photoelectric smoke fog siren circuit does not provide this function, needs special integrated circuit to realize this application, so just causes the user to need special buying chip to realize this function, has increased expense and the cost of buying.
Refer to Fig. 1, the photoelectric smoke fog siren integrated circuit that the model of Motorola Inc. of take is MC146010 is example, this photoelectric smoke fog siren integrated circuit can be realized mute function, it is flue that an optics labyrinth is arranged in the photoelectric smoke fog siren, it is that infrared receiving tube is received and infrared transmitting tube that infrared tube is installed, when 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 the intelligent alarm circuit judges surpasses setting threshold, if surpass, give the alarm.
Refer to Fig. 2, realize the physical circuit of mute function in the photoelectric smoke fog siren integrated circuit that model is MC146010, comprise resistance R 1 ', resistance R 2 ', capacitor C 1 ', feeler switch SW1 and quiet key SW2, the positive pole of 9V power supply, resistance R 1 ', resistance R 2 ' and capacitor C 1 ' series connection successively; Capacitor C 1 ' while ground connection; The end contact resistance R1 ' of quiet key SW2 and resistance R 2 ' the end that joins; The other end of quiet key SW2 connects the pin P16 of photoelectric smoke fog siren circuit; The 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.Resistance R 1 ' resistance be 10M Ω, resistance R 2 ' resistance be 4.7M Ω, capacitor C 1 ' be 0.47uF, resistance R 1 ' and resistance R 2 ' resistance value can be adjusted according to actual situation, and then determine the length of actual quiet time.
The point of MC146010 is if network use, and, at I/O termination one 33uF filter capacitor, device can not enter the HUSH state of default 10 minutes.Reason is to be 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 can make device enter the HUSH state, but the electric charge on 33uF electric capacity is within 128 to 256T times, have little time to give out light by the pull-down nmos pipe (MOS (metal-oxide-semiconductor) transistor) of device inside, then be considered to remote-end alarm, thus finish the HUSH state.
Summary of the invention
The object of the invention is to overcome the defect of prior art, and a kind of mute circuit for the photoelectric smoke fog siren is provided, by adopting improvement and the optimization of peripheral circuit, be applied in the photoelectric smoke fog siren, can well realize that HUSH(is quiet) function, meet client's requirement.
The technical scheme that realizes above-mentioned purpose is: a kind of mute circuit for the 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 the 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 and the collector of the first triode are connected successively;
The end that joins of described feeler switch and the first resistance is connected the positive pole of described 9V power supply;
The base stage of described the first triode connects the positive pole of described electric capacity by described the 3rd resistance, the base stage of described the first triode connects the negative pole of described electric capacity by described the 4th resistance, and the end ground connection of joining of the base stage of described the first triode and the 4th resistance, the grounded emitter of described the first triode;
The base stage of described the second triode connects the end that joins of described the first resistance and the second resistance, and the emitter of described the second triode connects the positive pole of described 9V power supply, and the collector of described the second triode connects the positive pole of described diode;
The negative pole of described diode connects described sensor.
The above-mentioned mute circuit for the photoelectric smoke fog siren, wherein, the span of described the first resistance is 1M Ω to 2M Ω.
The above-mentioned mute circuit for the photoelectric smoke fog siren, wherein, the span of described electric capacity is 100uF to 150uF.
The above-mentioned mute circuit for the photoelectric smoke fog siren, wherein, described the first triode is NPN type triode, described the second triode is the positive-negative-positive triode.
Compared with prior art, the beneficial effect of a kind of mute circuit for the photoelectric smoke fog siren of the present invention is: mute circuit of the present invention can be for 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 outsourcing chip, saved buying expenses and cost.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of MC146010 circuit;
Fig. 2 is the circuit diagram of mute circuit in the MC146010 circuit;
Fig. 3 is the circuit diagram of the mute circuit for the 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 be understood technical scheme of the present invention better, below by specific embodiment, also be described in detail by reference to the accompanying drawings.
Refer to Fig. 3, a kind of mute circuit for the photoelectric smoke fog siren of the present invention, external 9V power supply and sensor, mute circuit comprises capacitor C, feeler switch K, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first triode Q1, the second triode Q2 and diode D.The first resistance R 1, the 3rd resistance R 3 and the 4th resistance R 4 are high-ohmic resistor.
The positive pole of capacitor C, feeler switch K, the first resistance R 1, the second resistance R 2 are connected successively with the collector of the first triode Q1; The end that joins of feeler switch K and the first resistance R 1 is connected the positive pole of 9V power supply; The base stage of the first triode Q1 connects the positive pole of capacitor C by the 3rd resistance R 3, the base stage of the first triode Q1 connects the negative pole of capacitor C by the 4th resistance R 4, and the end ground connection of joining of the base stage of the first triode Q1 and the 4th resistance R 4, the grounded emitter of the first triode Q1; The base stage of the second triode Q2 connects the end that joins of the first resistance R 1 and the second resistance R 2, 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 the positive-negative-positive triode; The span of the first resistance R 1 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, capacitor C 14 is charged to supply voltage VDD, then by the first resistance R 1, the 3rd resistance R 3 and the 4th resistance R 4, slowly discharge, the second triode Q2 saturation conduction during this time, make the LED lamp of sensor bright, the purpose that reaching reports to the police stops, when the voltage drop of capacitor C when being not enough to maintain the second triode Q2 conducting, the sensitivity of photoelectric mist alarm is replied normal, and the LED lamp of sensor does not dodge the recovery normal condition.
Get different values for capacitor C, the first resistance R 1, the 3rd resistance R 3 and the 4th resistance R 4, quiet asynchronism(-nization), as shown in the table:
| C | R1 | R3 | R4 | The quiet time |
| 100uF | 1.5MΩ | 1.5MΩ | 1.5 |
10 minutes |
| 100uF | 1.5MΩ | 2MΩ | 1.5MΩ | 8 minutes |
| 100uF | 1.5MΩ | 1.5MΩ | 1.5 |
14 minutes |
The first resistance R 1 can change the degree of sensitivity, and the general range of the first resistance R 1 is 1M Ω to 2M Ω: when the first resistance R 1=1M Ω, sensitivity is minimum; Along with the increase of the resistance of the first resistance R 1, sensitivity increases.
The general 100uF of capacitor C can ensure enough duration of charging, can consider to increase to the 150uF left and right.But electric capacity too conference causes voltage drop very slow, and the quiet time is oversize; The 3rd resistance R 3 and the 4th resistance R 4 are a pair of combinations, can combine in the megohm rank, and this change, can make the quiet each time time not necessarily identical
Refer to Fig. 4, Fig. 4 is the schematic diagram that the present invention is applied to the photoelectric smoke fog siren, in figure, mute circuit of the present invention and photoelectric smoke fog siren integrated circuit are used in conjunction with, 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, it is BL59A12 that this smoke alarm integrated circuit adopts model.
In sum, mute circuit of the present invention can be for 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 without the outsourcing chip, has saved buying expenses and cost.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details in embodiment should not form limitation of the invention, the present invention will be usingd scope that appended claims defines as protection scope of the present invention.
Claims (4)
1. the mute circuit for the 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 the 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 and the collector of the first triode are connected successively;
The end that joins of described feeler switch and the first resistance is connected the positive pole of described 9V power supply;
The base stage of described the first triode connects the positive pole of described electric capacity by described the 3rd resistance, the base stage of described the first triode connects the negative pole of described electric capacity by described the 4th resistance, and the end ground connection of joining of the base stage of described the first triode and the 4th resistance, the grounded emitter of described the first triode;
The base stage of described the second triode connects the end that joins of described the first resistance and the second resistance, and the emitter of described the second triode connects the positive pole of described 9V power supply, and the collector of described the second triode connects the positive pole of described diode;
The negative pole of described diode connects described sensor.
2. the mute circuit for the photoelectric smoke fog siren according to claim 1, is characterized in that, the span of described the first resistance is 1M Ω to 2M Ω.
3. the mute circuit for the 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 the photoelectric smoke fog siren according to claim 1, is characterized in that, described the first triode is NPN type triode, and described the second triode is the positive-negative-positive 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 |
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| 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 true CN103473879A (en) | 2013-12-25 |
| CN103473879B 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970563A (en) * | 2017-04-12 | 2017-07-21 | 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 |
Citations (12)
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|---|---|---|---|---|
| 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 |
| WO2002071357A1 (en) * | 2001-02-16 | 2002-09-12 | 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 |
| EP1906371A2 (en) * | 2006-09-28 | 2008-04-02 | E.I. Technology Limited | Control of alarm devices |
| EP1988519A2 (en) * | 2000-08-11 | 2008-11-05 | Walter Kidde Portable Equipment, Inc. | Microprocessor-based combination smoke and carbon monoxide detector having intelligent hush feature |
| CN101520935A (en) * | 2009-04-02 | 2009-09-02 | 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 |
| US20110150188A1 (en) * | 2009-12-22 | 2011-06-23 | Minimax GmbH & Co., KG | Testing 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 |
-
2013
- 2013-09-18 CN CN201310426024.9A patent/CN103473879B/en active Active
Patent Citations (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 |
| EP1988519A2 (en) * | 2000-08-11 | 2008-11-05 | Walter Kidde Portable Equipment, Inc. | Microprocessor-based combination smoke and carbon monoxide detector having intelligent hush feature |
| WO2002071357A1 (en) * | 2001-02-16 | 2002-09-12 | 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 |
| EP1906371A2 (en) * | 2006-09-28 | 2008-04-02 | E.I. Technology Limited | Control of alarm devices |
| CN101520935A (en) * | 2009-04-02 | 2009-09-02 | 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 |
| US20110150188A1 (en) * | 2009-12-22 | 2011-06-23 | Minimax GmbH & Co., KG | Testing 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 |
Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970563A (en) * | 2017-04-12 | 2017-07-21 | 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 |
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| CN103473879B (en) | 2015-06-10 |
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