JPS54111299A - Erroneous function preventing circuit of smoke detector - Google Patents
Erroneous function preventing circuit of smoke detectorInfo
- Publication number
- JPS54111299A JPS54111299A JP1877078A JP1877078A JPS54111299A JP S54111299 A JPS54111299 A JP S54111299A JP 1877078 A JP1877078 A JP 1877078A JP 1877078 A JP1877078 A JP 1877078A JP S54111299 A JPS54111299 A JP S54111299A
- Authority
- JP
- Japan
- Prior art keywords
- generated
- circuit
- output
- integral circuit
- integration level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE: To prevent erroneous functions caused by intermittent noise and ensure accurate alarm function when a fire breaks out by connecting an integral circuit or counter circuit to the output side of AND circuit of smoke detector.
CONSTITUTION: If noise is picked up when pulse a is generated from oscillator 1, AND output c is generated and accumulated in integral circuit 7. However, if smoke detecting signal b from amplifier 5 is not generated when the next pulse a is generated, the accumulated electric charge is discharged so that integration level d of integral circuit 7 is reset to the initial value. Therefore, the integration level does not reach critical level VTH because of the generation of intermittent noise, thus preventing erroneous alarm output e from being produced. In case of a fire, smoke detecting signal b from amplifier 5 is continuously applied to AND output c is generated from oscillator 1, thus increasing integration level d of integral circuit 7 step by step. By setting the circuit constant of integral circuit 7, ensuring that integration level d exceeds critical level VTH, alarm output e is generated when a fire breaks out.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1877078A JPS54111299A (en) | 1978-02-21 | 1978-02-21 | Erroneous function preventing circuit of smoke detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1877078A JPS54111299A (en) | 1978-02-21 | 1978-02-21 | Erroneous function preventing circuit of smoke detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54111299A true JPS54111299A (en) | 1979-08-31 |
Family
ID=11980859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1877078A Pending JPS54111299A (en) | 1978-02-21 | 1978-02-21 | Erroneous function preventing circuit of smoke detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54111299A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832926A (en) * | 1981-08-21 | 1983-02-26 | Kubota Ltd | Engine abnormality judging method |
JPS61149847A (en) * | 1984-12-25 | 1986-07-08 | Matsushita Electric Works Ltd | Smoke sensor |
JPS62224890A (en) * | 1986-03-25 | 1987-10-02 | 松下電工株式会社 | Photoelectric type analog smoke sensor |
CN113450527A (en) * | 2020-03-27 | 2021-09-28 | 比亚迪股份有限公司 | Method, device and system for testing smoke perception function |
-
1978
- 1978-02-21 JP JP1877078A patent/JPS54111299A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832926A (en) * | 1981-08-21 | 1983-02-26 | Kubota Ltd | Engine abnormality judging method |
JPS6227251B2 (en) * | 1981-08-21 | 1987-06-13 | Kubota Tetsuko Kk | |
JPS61149847A (en) * | 1984-12-25 | 1986-07-08 | Matsushita Electric Works Ltd | Smoke sensor |
JPS62224890A (en) * | 1986-03-25 | 1987-10-02 | 松下電工株式会社 | Photoelectric type analog smoke sensor |
CN113450527A (en) * | 2020-03-27 | 2021-09-28 | 比亚迪股份有限公司 | Method, device and system for testing smoke perception function |
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