JPS61115291U - - Google Patents
Info
- Publication number
- JPS61115291U JPS61115291U JP19756984U JP19756984U JPS61115291U JP S61115291 U JPS61115291 U JP S61115291U JP 19756984 U JP19756984 U JP 19756984U JP 19756984 U JP19756984 U JP 19756984U JP S61115291 U JPS61115291 U JP S61115291U
- Authority
- JP
- Japan
- Prior art keywords
- fire
- capacitor
- emitter
- output stage
- receiving circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims 2
- 230000007257 malfunction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Fire-Detection Mechanisms (AREA)
Description
第１図は本考案の１実施例を示す電気回路図、
第２図は電源投入時に火災感知器回線に流れる突
入電流の１例を示す波形図である。
Ｌ，Ｃ：火災感知器回線、Ｒ１：終端抵抗、Ｄ
：火災感知器、ＱＨ１：火災受信回路の火災検知
用入力段トランジスタ、ＱＨ２：火災受信回路の
火災検知用出力段トランジスタ、Ｒ４：火災検知
抵抗、ＺＤ１〜ＺＤ３：ゼナーダイオード、ＣＦ
：コンデンサ、ＲＦ：火災受信リレー。
FIG. 1 is an electrical circuit diagram showing one embodiment of the present invention;
FIG. 2 is a waveform diagram showing an example of the rush current flowing through the fire detector line when the power is turned on. L, C: Fire detector line, R1: Terminal resistor, D
: Fire detector, QH1: Input stage transistor for fire detection of fire receiving circuit, QH2: Output stage transistor for fire detection of fire receiving circuit, R4: Fire detection resistor, ZD1 to ZD3: Zener diode, CF
: Capacitor, RF: Fire reception relay.
Claims (1)
火災監視電流が増大したとき、これを火災受信回
路で検出することにより火災の発生を感知する火
災感知装置において、火災監視電流を常時監視す
る前記火災受信回路の火災検知用出力段トランジ
スタをエミツタ接地すると共に、該トランジスタ
のベース・エミツタ間のコンデンサを並列に接続
し、該コンデンサの容量を、電源投入時に前記火
災感知器回線に流れる突入電流が少なくとも火災
検知レベル以下となる時間以上の遅延動作時間を
前記出力段トランジスタに与える容量としたこと
を特徴とする火災感知器の突入電流による誤動作
防止回路。 In a fire detection device that detects the occurrence of a fire by detecting this in a fire receiving circuit when a fire detector is activated and the fire monitoring current flowing through the fire detector line increases, the fire monitoring current is constantly monitored. The emitter of the output stage transistor for fire detection in the fire receiving circuit is grounded, and a capacitor between the base and emitter of the transistor is connected in parallel. A circuit for preventing malfunction due to inrush current of a fire detector, characterized in that a capacitor is used to provide the output stage transistor with a delay operation time that is at least longer than the time required for the temperature to drop below a fire detection level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19756984U JPS61115291U (en) | 1984-12-28 | 1984-12-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19756984U JPS61115291U (en) | 1984-12-28 | 1984-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61115291U true JPS61115291U (en) | 1986-07-21 |
Family
ID=30755934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19756984U Pending JPS61115291U (en) | 1984-12-28 | 1984-12-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61115291U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644994A (en) * | 1979-09-19 | 1981-04-24 | Nittan Co Ltd | Fire alarm |
| JPS5937912U (en) * | 1982-08-27 | 1984-03-10 | 株式会社トヨトミ | Heating coil holding structure of combustion tube |
-
1984
- 1984-12-28 JP JP19756984U patent/JPS61115291U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644994A (en) * | 1979-09-19 | 1981-04-24 | Nittan Co Ltd | Fire alarm |
| JPS5937912U (en) * | 1982-08-27 | 1984-03-10 | 株式会社トヨトミ | Heating coil holding structure of combustion tube |
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