CN101853007A - Smoke detection control circuit - Google Patents
Smoke detection control circuit Download PDFInfo
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- CN101853007A CN101853007A CN 201010202411 CN201010202411A CN101853007A CN 101853007 A CN101853007 A CN 101853007A CN 201010202411 CN201010202411 CN 201010202411 CN 201010202411 A CN201010202411 A CN 201010202411A CN 101853007 A CN101853007 A CN 101853007A
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Abstract
The invention relates to a smoke detection control circuit, which comprises an amplifier, an oscillator, a sequential logical circuit, a reference power supply, a comparator, an alarming circuit, a multiplexer and a timer, wherein the input end of the multiplexer is connected with the output end of the amplifier and receives a mute signal, while the output end is connected with the negative input end of the comparator; and the timer receives a test signal and outputs a clock signal to the multiplexer. In the invention, the requirements of hush can be met by improving the functions of the control circuit, namely using the multiplexer in the control circuit to enable a peripheral chip to conduct functions required by the hush, and meanwhile, a normal photoelectric smoke alarming control function can be realized by a simple method for users not requiring hush functions; and thus, the functions of two chips in the prior art can be realized, the cost is saved, and the needs of more users can be satisfied.
Description
Technical field
The present invention relates to integrated circuit, relate in particular to the smoke detection control circuit of a kind of hush of selection (quiet) function.
Background technology
As everyone knows, an optics labyrinth is arranged in the photoelectric mist detecting alarm, and infrared tube is installed, be i.e. infrared receiving tube and infrared transmitting tube; At present, the main supporting employing of photoelectric type smoke detection alarm be a kind of control special circuit that provides by Motorola Inc.---Freescale semiconductor (MC145010), and adopt the method that cooperation is debugged with relevant peripheral circuit to reach systemic-function, satisfy the requirement of system manufacturer substantially with this; As shown in Figure 1, above-mentioned control special circuit comprises amplifier 1 ', oscillator 2 ', sequential logical circuit 3 ', reference power source 4 ', first comparer 5 ', second comparer 6 ' and the warning circuit 7 '.By the above-mentioned control circuit of supporting use, make photoelectric mist detecting alarm infrared receiving tube when smokeless can not receive the infrared light that infrared transmitting tube sends, when flue dust enters the optics labyrinth, by refraction, reflection, receiving tube receives infrared light, warning circuit judges whether to surpass threshold value, sounds the alarm if surpass then drive peripheral hummer, thereby reaches the purpose of surveying smog.
Along with the continuous expansion of photoelectric mist detecting alarm range of application, some user has proposed the requirement of alarm to alarm; In the prior art,, normally, for example adopt the A5358 chip of allegro company, thereby the gain of alarm is dwindled within a certain period of time, thereby realize the hush function at chip of the peripheral increase of alarm in order to reach the requirement of this alarm.Yet this mode has increased cost undoubtedly, and in addition, because environmental requirement needs the frequent situation of switching Normal Alarm and two kinds of patterns of alarm, above-mentioned mode has been brought inconvenience greatly for it at some user.
Summary of the invention
In order to overcome the deficiency that prior art exists, the present invention aims to provide a kind of smoke detection control circuit, to reach on the basis of realizing normal photoelectric type smog alarm control function the requirement that the realization hush that can freely select reports to the police.
A kind of smoke detection control circuit of the present invention, it comprises amplifier, oscillator, sequential logical circuit, reference power source, comparer and warning circuit, described control circuit also comprises a multiplexer and a timer,
The input end of described multiplexer is connected with the output terminal of described amplifier, and receives a mute signal, and its output terminal is connected with the negative input end of described comparer;
Described timer receives a test signal, and exports a clock signal to described multiplexer.
In above-mentioned smoke detection control circuit, described amplifier input terminal is connected with first, second electric capacity of periphery respectively, and receives a detectable signal;
The input end of described oscillator is connected with the resistance of periphery, and receives an oscillator signal, and its output terminal is connected with the input end of described sequential logical circuit;
Described sequential logical circuit receives described test signal, and its output terminal is connected with the diode of periphery, described amplifier and reference power source respectively, and exports outside infrared signal to described diode;
Described reference power source is connected with the positive input terminal of described comparer, and exports a strobe signal;
The output terminal of described comparer is connected with the input end of described warning circuit;
Described warning circuit receives an input/output signal and a feedback signal, and exports a buzzerphone to a peripheral hummer.
Owing to adopted above-mentioned technical solution, the present invention's perfect by to the control circuit function, promptly realize that at the inner multiplexer that adopts of control circuit peripheral chip reaches the function that hush requires, can satisfy the hush requirement, at the user who does not need the hush function, also can realize normal photoelectric type smog alarm control function simultaneously by simple method; Thereby realized the function of two large chips in original technology, provided cost savings, satisfied the demand of more users.
Description of drawings
Fig. 1 is the functional block diagram of existing photoelectric type smoke detection control special circuit;
Fig. 2 is the theory diagram of a kind of smoke detection control circuit of the present invention.
Embodiment
As shown in Figure 2, the present invention, promptly a kind of smoke detection control circuit, it comprises amplifier 1, oscillator 2, sequential logical circuit 3, multiplexer 4, timer 5, comparer 6, reference power source 7 and warning circuit 8, wherein,
The input end of amplifier 1 is connected with first, second capacitor C 1, the C2 of periphery respectively, and receives a detectable signal DETECT;
The input end of oscillator 2 is connected with the resistance R I of periphery, and receives an oscillator signal OSC, and its output terminal is connected with the input end of sequential logical circuit 3;
Sequential logical circuit 3 receives a test signal TEST, and its output terminal is connected with diode (LED) (being infrared tube), amplifier 1 and the reference power source 7 of periphery respectively, and exports outside infrared signal IRED to diode (LED);
The input end of multiplexer 4 is connected with the output terminal of amplifier 1, and receives a mute signal LSSET, and its output terminal is connected with the negative input end of comparer 6;
Comparer 6 positive input terminal be connected with reference power source 7, its output terminal is connected with the input end of warning circuit 8;
Reference power source 7 outputs one strobe signal STROBE;
Among the present invention, amplifier 1 direct and infrared inspection device (infrared electro receiving tube and infrared electro power valve) coupling, the enlargement factor size of amplifier 1 is by first, second capacitor C 1, the C2 decision of periphery; When control circuit of the present invention is in holding state, the enlargement factor Av=1+C2/10pF of amplifier 1; After continuous three tests have smog, the enlargement factor Av=1+C2/9pF of amplifier 1; When control circuit of the present invention enters test mode, the enlargement factor Av=1+C1/10pF of amplifier 1; Establish level ratio through in the amplifying signal and, non smoke is arranged, then drive buzzer warning if having with judgement; When control circuit of the present invention is in the hush state, then diac LED flicker (cycle is 10.8 seconds).
Difference when circuit is different from holding state during the hush state is: during the hush state, and amplifying signal and mute signal LSSET, promptly hush end level ratio is; When hush end ground connection or hush hold when unsettled, then forbid the hush function, can realize normal photoelectric type smog alarm control function; Otherwise enter the hush function, at this moment, need at first press the test key, promptly import the test signal, and make its size equal supply voltage Vdd, then unclamp the test key, promptly cut off the test signal, device can be operated in the muting sensitivity state, and (size of sensitivity directly determines by being connected the peripheral resistance of hush end, even hush is held unsettled, also do not influence client's low-voltage warning function, use and can be used as normal photoelectric type smoke alarm circuit), and the timer setting-up time is 10 minutes (representative value), breaks away from the hush state then automatically, gets back to normal condition.
Show that in the circuit hush of reality Function detection when mute signal LSSET was 1.6V, circuit can enter silent mode, during this period, hummer stops shouting; Muting sensitivity is tested and is forbidden, but still can do low voltage test, and the flicker cycle of LED is 10.75 seconds (representative value), and 10 minutes withdraw from silent mode after (representative value).
In sum, the present invention can be used for the smoke detection system of multiple systems manufacturer, and well satisfies the requirement that smoke detection plays the device system manufacturer, is guaranteeing under the prerequisite of systemic-function comprehensively, optimize the performance of device greatly, satisfied many-sided requirement of client.
Below embodiment has been described in detail the present invention in conjunction with 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 among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (2)
1. smoke detection control circuit, it comprises amplifier, oscillator, sequential logical circuit, reference power source, comparer and warning circuit, it is characterized in that, described control circuit also comprises a multiplexer and a timer,
The input end of described multiplexer is connected with the output terminal of described amplifier, and receives a mute signal, and its output terminal is connected with the negative input end of described comparer;
Described timer receives a test signal, and exports a clock signal to described multiplexer.
2. smoke detection control circuit according to claim 1 is characterized in that,
Described amplifier input terminal is connected with first, second electric capacity of periphery respectively, and receives a detectable signal;
The input end of described oscillator is connected with the resistance of periphery, and receives an oscillator signal, and its output terminal is connected with the input end of described sequential logical circuit;
Described sequential logical circuit receives described test signal, and its output terminal is connected with the diode of periphery, described amplifier and reference power source respectively, and exports outside infrared signal to described diode;
Described reference power source is connected with the positive input terminal of described comparer, and exports a strobe signal;
The output terminal of described comparer is connected with the input end of described warning circuit;
Described warning circuit receives an input/output signal and a feedback signal, and exports a buzzerphone to a peripheral hummer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010202411 CN101853007A (en) | 2010-06-18 | 2010-06-18 | Smoke detection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010202411 CN101853007A (en) | 2010-06-18 | 2010-06-18 | Smoke detection control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101853007A true CN101853007A (en) | 2010-10-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010202411 Pending CN101853007A (en) | 2010-06-18 | 2010-06-18 | Smoke detection control circuit |
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| CN (1) | CN101853007A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108122363A (en) * | 2016-11-28 | 2018-06-05 | 无锡华润矽科微电子有限公司 | For the integrated circuit and system of smog alarm |
| CN109345759A (en) * | 2018-11-12 | 2019-02-15 | 聂士雪 | A kind of ion type smog alarm |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896091A (en) * | 1997-02-19 | 1999-04-20 | Ranco Inc. Of Delaware | Dangerous condition warning device incorporating a replaceable sensor and apparatus to prevent the sensor from being improperly installed |
| US5966078A (en) * | 1997-02-19 | 1999-10-12 | Ranco Inc. | Battery saving circuit for a dangerous condition warning device |
| US6426703B1 (en) * | 1997-08-07 | 2002-07-30 | Brk Brands, Inc. | Carbon monoxide and smoke detection apparatus |
| US6642849B1 (en) * | 2001-12-11 | 2003-11-04 | Maple Chase Company | Hush disable feature for photoelectric smoke alarm |
| EP1426908A2 (en) * | 2002-11-15 | 2004-06-09 | Maple Chase Company | Temporary alarm locate with intermittent warning |
| CN101169362A (en) * | 2006-10-26 | 2008-04-30 | 上海贝岭股份有限公司 | Indoor fog detected and controlled integrated circuit |
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2010
- 2010-06-18 CN CN 201010202411 patent/CN101853007A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896091A (en) * | 1997-02-19 | 1999-04-20 | Ranco Inc. Of Delaware | Dangerous condition warning device incorporating a replaceable sensor and apparatus to prevent the sensor from being improperly installed |
| US5966078A (en) * | 1997-02-19 | 1999-10-12 | Ranco Inc. | Battery saving circuit for a dangerous condition warning device |
| US6426703B1 (en) * | 1997-08-07 | 2002-07-30 | Brk Brands, Inc. | Carbon monoxide and smoke detection apparatus |
| US6642849B1 (en) * | 2001-12-11 | 2003-11-04 | Maple Chase Company | Hush disable feature for photoelectric smoke alarm |
| EP1426908A2 (en) * | 2002-11-15 | 2004-06-09 | Maple Chase Company | Temporary alarm locate with intermittent warning |
| CN101169362A (en) * | 2006-10-26 | 2008-04-30 | 上海贝岭股份有限公司 | Indoor fog detected and controlled integrated circuit |
Non-Patent Citations (3)
| Title |
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| 《GOOGLE》 20080325 无 BL59A66 1 , 2 * |
| 《http://www.belling.com.cn/2010p/BL5966.pdf》 20080325 匿名 BL59A66 datasheet 1-2 , 2 * |
| 《微计算机信息》 张中向等 基于CAN通信的烟雾报警监控系统设计 , 第11期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108122363A (en) * | 2016-11-28 | 2018-06-05 | 无锡华润矽科微电子有限公司 | For the integrated circuit and system of smog alarm |
| CN109345759A (en) * | 2018-11-12 | 2019-02-15 | 聂士雪 | A kind of ion type smog alarm |
| CN109345759B (en) * | 2018-11-12 | 2020-08-14 | 江苏河马自动化设备有限公司 | Ion type smoke alarm |
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Application publication date: 20101006 |