JPH0498600A - Automatic return type smoke sensor - Google Patents
Automatic return type smoke sensorInfo
- Publication number
- JPH0498600A JPH0498600A JP21579190A JP21579190A JPH0498600A JP H0498600 A JPH0498600 A JP H0498600A JP 21579190 A JP21579190 A JP 21579190A JP 21579190 A JP21579190 A JP 21579190A JP H0498600 A JPH0498600 A JP H0498600A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- level
- output
- light
- 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.)
- Granted
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000011084 recovery Methods 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 12
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 244000145845 chattering Species 0.000 description 2
- 208000018583 New-onset refractory status epilepticus Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Fire-Detection Mechanisms (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、煙の検出レベルが所定時間、所定レベルを
越えた時に動作信号を出力し、煙の検出レベルが所定時
間、所定レベルを下回る時に復旧する自動復帰型煙感知
器に関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention outputs an operation signal when the smoke detection level exceeds the predetermined level for a predetermined time, and when the smoke detection level falls below the predetermined level for a predetermined time. This relates to an automatic reset type smoke detector that can be restored at certain times.
［従来の技術］
従来、火災の煙を検出する感知器の中には、実公平２−
１９９００号公報に示されているように、パルス点灯す
る発光素子を用いて、発光素子の煙による光を受光して
火災の煙を感知し動作信号を出力し、煙がなくなったこ
とを感知して動作信号の出力を停止する煙感知器におい
て、煙がなくなってもすぐに復帰せず、所定時間経過し
た後に復帰するようにして、動作時のチャタリングを防
止した自動復帰型煙感知器がある。[Prior art] Conventionally, some detectors for detecting smoke from fires are
As shown in Japanese Patent No. 19900, a light emitting element that lights up in pulses is used to detect smoke from a fire by receiving light from smoke from the light emitting element, outputting an operation signal, and detecting that the smoke is gone. Among smoke detectors that stop outputting operating signals when the smoke disappears, there is an automatic reset type smoke detector that does not reset immediately when the smoke disappears, but resets after a predetermined period of time to prevent chattering during operation. .
［発明が解決しようとする課題］
実公平２−１９９００号公報に示されている自動復帰型
煙感知器は、レベル判定回路の出力により充放電するコ
ンデンサの両端電圧と基準電圧とを比較して復帰する時
を決定しているので、コンデンサ、抵抗等のばらつき、
経年変化等が直接感知器の動作機能に影響する欠点があ
り、大量生産の場合に特に品質管理上問題があった。[Problems to be Solved by the Invention] The automatic reset type smoke detector disclosed in Utility Model Publication No. 2-19900 compares the voltage across a capacitor that is charged and discharged based on the output of a level determination circuit with a reference voltage. Since the time to recover is determined, variations in capacitors, resistors, etc.
There is a drawback that aging and other factors directly affect the operating function of the sensor, which poses problems in terms of quality control, especially in the case of mass production.
［課題を解決するための手段］
この発明の自動復旧型煙感知器は、パルス発振回路の出
力によりパルス点灯する発光素子と、該発光素子からの
光の煙による変化に応じた受光信号を出力する受光素子
と、該受光素子の受光信号を増幅し検出信号を出力する
増幅回路と、上記パルス発振回路の出力と同期して上記
増幅回路の検出信号が連続して複数回動作レベルを越え
たときに動作信号を保持して出力し、該動作信号の保持
が解除されてから上記動作レベルを下回る上記検出信号
が出力された時に動作信号の出力を停止する動作判別回
路と、上記動作信号が出力中に上記パルス発振回路の出
力と同期して、上記検出信号が上記動作レベルと同じか
またはこれより低く設定された復旧レベルを連続して複
数回下回る時に上記動作判別回路の上記動作信号の出力
保持を解除する復旧判別回路と、上記動作判別回路の上
記動作信号に基づいて駆動され外部に動作信号を出力す
る出力回路とを備えたことを特徴とするものである。[Means for Solving the Problems] The automatic recovery type smoke detector of the present invention includes a light emitting element that lights up in pulses according to the output of a pulse oscillation circuit, and outputs a light reception signal in response to a change in light from the light emitting element due to smoke. an amplifier circuit that amplifies the light-receiving signal of the light-receiving element and outputs a detection signal; and a detection signal of the amplifier circuit that exceeds the operating level multiple times in a row in synchronization with the output of the pulse oscillation circuit. an operation determination circuit that holds and outputs the operation signal when the operation signal is released, and stops outputting the operation signal when the detection signal that is lower than the operation level is output after the holding of the operation signal is released; During output, in synchronization with the output of the pulse oscillation circuit, when the detection signal falls below a recovery level that is set to be the same as or lower than the operating level several times in a row, the operating signal of the operating discrimination circuit is activated. The present invention is characterized in that it includes a recovery determination circuit that releases output retention, and an output circuit that is driven based on the operation signal of the operation determination circuit and outputs the operation signal to the outside.
［実施例］
この発明の自動復帰型煙感知器の一実施例を図面に基づ
いて詳細に説明する。[Embodiment] An embodiment of the automatic reset type smoke detector of the present invention will be described in detail based on the drawings.
第１図は、この発明の自動復帰型煙感知器の一実施例を
示すブロック回路図である。この自動復帰型煙感知器は
、各部に所定の安定した電源電圧を供給する安定化電源
回路１と、所定の周期によりパルス信号を出力するパル
ス発振回路２と、ノ（ルス発振回路２のパルス出力によ
り駆動される発光素子５と、発光素子５からの光の煙に
よる変化に応じた受光信号を出力する受光素子６と、受
光素子６の受光信号を増幅する増幅回路４と、コンデン
サＣ１を介した増幅回路４の検出信号をパルス発振回路
２のパルス信号と同期して、動作、復旧の判断を行なう
判断処理回路３と、ダイオードＳ１．抵抗Ｒ１，Ｒ２、
トランジスタＴ１、ツェナーダイオードＺ１からなり判
断処理回路３の動作信号を外部に出力する出力回路とか
ら構成されている。尚、端子７，８には受信機から信号
兼電源線路を介して電源が供給されている。FIG. 1 is a block circuit diagram showing an embodiment of the automatic reset type smoke detector of the present invention. This automatic reset type smoke detector consists of a stabilized power supply circuit 1 that supplies a predetermined stable power supply voltage to each part, a pulse oscillation circuit 2 that outputs a pulse signal at a predetermined period, and a pulse oscillation circuit 2 that outputs a pulse signal at a predetermined period. A light-emitting element 5 driven by the output, a light-receiving element 6 that outputs a light-receiving signal according to changes in light from the light-emitting element 5 due to smoke, an amplifier circuit 4 that amplifies the light-receiving signal of the light-receiving element 6, and a capacitor C1. A judgment processing circuit 3 that makes a judgment on operation and recovery by synchronizing the detection signal of the amplifier circuit 4 via the pulse signal with the pulse signal of the pulse oscillation circuit 2, and a diode S1, resistors R1, R2,
The output circuit includes a transistor T1 and a Zener diode Z1, and outputs an operation signal of the judgment processing circuit 3 to the outside. Note that power is supplied to the terminals 7 and 8 from the receiver via a signal/power supply line.
次に、動作について説明すると、
通常、パルス発振回路２は所定周期のパルス信号を出力
して発光素子５並びに判断処理回路３に供給している０
発光素子５はパルス点灯して煙監視空間にパルス光を照
射する。受光素子６はパルス光の煙による散乱光または
透過光を受光して煙の濃度に応じた電流を発生し、増幅
回路４により所定の検出信号にする。この検出信号はコ
ンデンサＣ１を介して判断処理回路３に入力（端子３０
）される０判断処理回路３はパルス発振回路２のパルス
信号と同期して煙が検出される時は出力端子３２にハイ
レベルの信号を出力し、煙が検出されなくなった時には
ローレベルの信号に復帰する。Next, the operation will be explained. Normally, the pulse oscillation circuit 2 outputs a pulse signal with a predetermined period and supplies it to the light emitting element 5 and the judgment processing circuit 3.
The light emitting element 5 lights up in pulses and irradiates the smoke monitoring space with pulsed light. The light receiving element 6 receives the scattered or transmitted light of the pulsed light caused by the smoke, generates a current according to the density of the smoke, and converts it into a predetermined detection signal by the amplifier circuit 4. This detection signal is input to the judgment processing circuit 3 via the capacitor C1 (terminal 30
) 0 judgment processing circuit 3 outputs a high level signal to the output terminal 32 when smoke is detected in synchronization with the pulse signal of the pulse oscillation circuit 2, and outputs a low level signal when smoke is no longer detected. to return to.
ハイレベルの信号が出力されている時にはダイオードＳ
ｌ、抵抗Ｒ１を介してトランジスタＴ１にベース電流が
供給されてオン状態になり、端子７８間はツェナーダイ
オードｚ１を介して導通する。When a high level signal is output, the diode S
A base current is supplied to the transistor T1 via the resistor R1 to turn it on, and conduction occurs between the terminals 78 via the Zener diode z1.
この時の電流、電圧の変化を受信機側（図示せず〉で検
出して感知器が動作中であることを識別できる。また動
作中でもツェナーダイオードＺ１の両端間の電圧により
感知器の他の部分には引き続き電源が供給され煙検出機
能、判断処理回路３の処理機能は維持されている。Changes in current and voltage at this time can be detected by the receiver side (not shown) to identify that the sensor is in operation.Also, even during operation, the voltage across the Zener diode Z1 indicates that the other sensor Power continues to be supplied to the parts, and the smoke detection function and the processing function of the judgment processing circuit 3 are maintained.
第２図は第１図に示した判断処理回路３の一実施例を示
すブロック回路図である。この判断処理回路３は、ＣＭ
Ｏ３よりなるフリップフロップ回路ＦＦＯ，ＦＦ３、抵
抗Ｒ５、Ｒ６，Ｒ８，Ｒ９、ダイオードＳ２．Ｓ３、ア
ンド回路ＡＮＢからなる動作判別回路と、ＣＭＯ３より
なるフリップフロップ回路ＦＦＩ、ＦＦ２、抵抗Ｒ３，
Ｒ４，Ｒ７、ＲＩＯ、アンド回路ＡＮＩ、ＡＮ２、トラ
ンジスタＴ２からなる復旧判別回路とから構成されてい
る。FIG. 2 is a block circuit diagram showing one embodiment of the judgment processing circuit 3 shown in FIG. 1. This judgment processing circuit 3
Flip-flop circuit FFO, FF3 consisting of O3, resistors R5, R6, R8, R9, diode S2. S3, an operation determination circuit consisting of an AND circuit ANB, a flip-flop circuit FFI consisting of CMO3, FF2, a resistor R3,
It is composed of R4, R7, RIO, AND circuits ANI and AN2, and a recovery determination circuit consisting of a transistor T2.
このように構成された判断処理回路３の動作を第３図に
示したタイミングチャートに基づし１て説明する。The operation of the judgment processing circuit 3 configured as described above will be explained based on the timing chart shown in FIG.
通常、端子３１にはパルス発振回路２からクロックパル
スＣＫが供給されている。端子３０からは増幅回路４よ
り検出信号ＤＩが供給されて抵抗Ｒ４を介してフリップ
フロップ回路ＦＦ１のデータ入力Ｄ１に、また抵抗Ｒ５
，Ｒ６により分圧されてダイオードＳ２を介してフリッ
プフロ・ンプ回路ＦＦＯのデータ入力ＤＯに入力される
。フリ・ｙブフロップ回路ＦＦＯ〜ＦＦ３はＣＭＯ８な
ので入力スレシュホールド電圧は電源電圧の半分であり
検出信号ＤＩの大きさがレベルＶ１を越えた時にフリッ
プフロップ回路ＦＦＯは入力をハイレベルとして捕らえ
、またレベル■２を越えた時にフリップフロップ回路Ｆ
ＦＩは入力をノ１イレベルとして捕らえるように抵抗Ｒ
３〜Ｒ６が設定されている。フリップフロップ回路ＦＦ
Ｏ〜ＦＦ３はクロックパルスＣＫの立ち上がり時にデー
タ入力の状態（ハイまたはローレベル）を出力Ｑに保持
する。従って、フリップフロップ回路ＦＦＯとＦＦ３の
出力ＱＯ，Ｑ３が供にハイレベルになる時は２回続けて
検出信号ＤＩがレベル■１を越えた時である。この時ア
ンド回路ＡＮ３の出力はノ＼イレベルになり動作信号Ｏ
ＵＴとして端子３２より出力する。そして、この動作信
号ＯＵＴは抵抗Ｒ８、ダイオードＳ３を介してフリップ
フロ・ンブ回路ＦＦＯのデータ入力り。に印加されるの
でフリップフロップＦＦＯ，ＦＦ３はこの状態を保持す
る。Normally, a clock pulse CK is supplied to the terminal 31 from the pulse oscillation circuit 2. A detection signal DI is supplied from the amplifier circuit 4 from the terminal 30 to the data input D1 of the flip-flop circuit FF1 via the resistor R4, and to the data input D1 of the flip-flop circuit FF1 via the resistor R4.
, R6 and is input to the data input DO of the flip-flop circuit FFO via the diode S2. Since the flip-flop circuits FFO to FF3 are CMO8, the input threshold voltage is half of the power supply voltage, and when the magnitude of the detection signal DI exceeds the level V1, the flip-flop circuit FFO captures the input as a high level, and the level ■ When the value exceeds 2, the flip-flop circuit F
FI is a resistor R so that the input is captured as a level of 1.
3 to R6 are set. flip-flop circuit FF
O to FF3 hold the data input state (high or low level) at the output Q at the rising edge of the clock pulse CK. Therefore, the outputs QO and Q3 of the flip-flop circuits FFO and FF3 both become high level when the detection signal DI exceeds level 1 twice in a row. At this time, the output of the AND circuit AN3 becomes the noise level and the operation signal O
Output from terminal 32 as UT. This operating signal OUT is input as data to the flip-flop circuit FFO via resistor R8 and diode S3. , so the flip-flops FFO and FF3 maintain this state.
一方、フリップフロップ回路ＦＦ１は検出信号ＤＩがレ
ベル■２を超えると反転出力（ｉｔがローレベルになる
のでアンド回路ＡＮＩの出力はローレベルになる。この
ため、アンド回路ＡＮ２の出力もローレベルになりトラ
ンジスタＴ２はオ、）状態になっている。検出信号ＤＩ
がレベル■２を連続して２回下回るとフリップフロップ
回路ＦＦｌＦＦ２の反転出力（１１，０２は供にハイレ
ベルになりアンド回路ＡＮＩの出力はハイレベルになる
。On the other hand, when the detection signal DI exceeds level 2, the flip-flop circuit FF1 outputs an inverted signal (it becomes a low level, so the output of the AND circuit ANI becomes a low level. Therefore, the output of the AND circuit AN2 also becomes a low level. Therefore, the transistor T2 is in the OFF state. Detection signal DI
When the voltage falls below level 2 twice in succession, the inverted outputs (11 and 02) of the flip-flop circuit FFlFF2 both become high level, and the output of the AND circuit ANI becomes high level.
このとき動作信号ＯＵＴが出力（アンド回路ＡＮ３の出
力がハイレベル）されているとアンド回路ＡＮ２の出力
はハイレベルになり、トランジスタＴ２はオン状態にな
る。抵抗Ｒ９は抵抗Ｒ８より一桁低い抵抗値に選ばれて
いるのでフリップフロラ１ＦＦＯのデータ入力り。に印
加されているアンド回路ＡＮ３の出力のハイレベルの信
号（動作信号ＯＵＴ＞は遮断される。フリップフロップ
回路ＦＦＯのデータ入力り。には検出信号ＤＩによるレ
ベルのパルスが印加されるようになる。次の検出信号Ｄ
ＩがレベルＶ１より下回る場合にはフリップフロップＦ
ＦＯの出力Ｑ。はローレベルになるのでアンド回路ＡＮ
３の出力はローレベルになり動作信号ＯＵＴは復旧する
。At this time, if the operation signal OUT is being output (the output of the AND circuit AN3 is at a high level), the output of the AND circuit AN2 is at a high level, and the transistor T2 is turned on. Resistor R9 is selected to have a resistance value one order of magnitude lower than resistor R8, so it can be used as a data input for Flip Flora 1FFO. The high-level signal (operating signal OUT) of the output of the AND circuit AN3 applied to is cut off. A pulse of the level according to the detection signal DI is applied to the data input of the flip-flop circuit FFO. .Next detection signal D
If I is below level V1, flip-flop F
FO output Q. becomes low level, so the AND circuit AN
The output of No. 3 becomes low level and the operation signal OUT is restored.
即ち、最初に煙検出レベル（検出信号ＤＩ）がレベルＶ
１を連続して２回超えると端子３２より動作信号ＯＵＴ
が出力されこの状態を保持する。That is, first the smoke detection level (detection signal DI) is level V.
When the value exceeds 1 twice in a row, the operation signal is output from terminal 32.
is output and maintains this state.
そしてその後、検出信号ＤＩがレベル■２を２回連続し
て下回り、さらに次の検出信号ＤＩがレベル■１を下回
る場合に復旧する。Thereafter, when the detection signal DI falls below the level ■2 twice in a row and the next detection signal DI falls below the level ■1, recovery is achieved.
第２図の実施例では、動作判別回路の検出レベルＶ１は
復旧判別回路の検出レベル■２より少し高く設定されて
いるが、同じレベルであってもよく復旧判別回路の復旧
レベルに違いがあるだけである。In the embodiment shown in FIG. 2, the detection level V1 of the operation discrimination circuit is set slightly higher than the detection level ■2 of the recovery discrimination circuit, but they may be at the same level and there is a difference in the recovery level of the recovery discrimination circuit. Only.
このように、動作と復旧との判別をそれぞれ正確な蓄積
回路により行なうことができる。In this way, it is possible to discriminate between operation and recovery using accurate storage circuits.
［発明の効果］
以上説明したように、この発明の自動復帰型煙感知品出
は検出信号が所定動作レベル付近を上下している場合で
あっても動作信号とこの復旧が短時間で繰り返すことは
なく、即ち、チャタリングを防止して、また、検出信号
のレベル比較と、クロックパルスに同期したデジタル回
路による判断処理により調整がほとんど必要ない自動復
帰型煙感知器を提供することができる効果がある。[Effects of the Invention] As explained above, the automatic reset type smoke sensor product of the present invention is capable of repeating the operation signal and this recovery in a short time even when the detection signal fluctuates around the predetermined operation level. In other words, it is possible to provide an automatic reset type smoke detector that prevents chattering and requires almost no adjustment due to level comparison of detection signals and judgment processing by a digital circuit synchronized with clock pulses. be.
第１図はこの発明の自動復帰型煙感知器の一実施例を示
すブロック回路図、第２図は第１図の判断処理回路の一
実施例を示すブロック回路図、第３図は第２図の動作を
説明するタイミングチャートである。
１・・・安定化電源回路、２・・ノ（ルス発振回路、３
・判断処理回路、４・・・増幅回路、５・・・発光素子
、６・・・受光票子、Ｒ１〜ＲＩＯ・・・抵抗、Ｃ１・
・・コンデンサ、Ｚトツエナーダイオード、８１〜Ｓ３
・・・ダイオード、Ｔ１・Ｔ２・・トランジスタ、ＦＦ
Ｏ〜ＦＦ３・・フリップフロ・ンプ回路、ＡＮＩ〜ＡＮ
３・・・アンド回路。FIG. 1 is a block circuit diagram showing an embodiment of the automatic reset type smoke detector of the present invention, FIG. 2 is a block circuit diagram showing an embodiment of the judgment processing circuit of FIG. 1, and FIG. 5 is a timing chart illustrating the operation shown in the figure. 1... Stabilized power supply circuit, 2... Norse oscillation circuit, 3
- Judgment processing circuit, 4... Amplification circuit, 5... Light emitting element, 6... Light receiving tag, R1 to RIO... Resistor, C1.
・Capacitor, Z tozener diode, 81~S3
...Diode, T1/T2...Transistor, FF
O~FF3...Flip-flop amplifier circuit, ANI~AN
3...AND circuit.
Claims (1)
、 該発光素子からの光の煙による変化に応じた受光信号を
出力する受光素子と、 該受光素子の受光信号を増幅し検出信号を出力する増幅
回路と、 上記パルス発振回路の出力と同期して上記増幅回路の検
出信号が連続して複数回動作レベルを越えたときに動作
信号を保持して出力し、該動作信号の保持が解除されて
から上記動作レベルを下回る上記検出信号が出力された
時に上記動作信号の出力を停止する動作判別回路と、 上記動作信号が出力中に上記パルス発振回路の出力と同
期して、上記検出信号が上記動作レベルと同じかまたは
これより低く設定された復旧レベルを連続して複数回下
回る時に上記動作判別回路の上記動作信号の出力保持を
解除する復旧判別回路と、 上記動作判別回路の上記動作信号に基づいて駆動され外
部に動作信号を出力する出力回路とを備えたことを特徴
とする自動復帰型煙感知器。[Scope of Claims] A light-emitting element that lights up in pulses according to the output of a pulse oscillation circuit, a light-receiving element that outputs a light-receiving signal in response to changes in light from the light-emitting element due to smoke, and a light-receiving element that amplifies the light-receiving signal of the light-receiving element. an amplifier circuit that outputs a detection signal; and an amplifier circuit that holds and outputs an operating signal when the detection signal of the amplifier circuit exceeds an operating level multiple times in a row in synchronization with the output of the pulse oscillation circuit; an operation determination circuit that stops outputting the operation signal when the detection signal that is lower than the operation level is output after the retention of the operation signal is released; , a recovery determination circuit that releases the output retention of the operation signal of the operation determination circuit when the detection signal falls below a recovery level that is set to be the same as or lower than the operation level multiple times in a row; An automatic reset type smoke detector comprising: an output circuit that is driven based on the operating signal of the circuit and outputs the operating signal to the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2215791A JP2554287B2 (en) | 1990-08-17 | 1990-08-17 | Automatic reset type smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2215791A JP2554287B2 (en) | 1990-08-17 | 1990-08-17 | Automatic reset type smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0498600A true JPH0498600A (en) | 1992-03-31 |
| JP2554287B2 JP2554287B2 (en) | 1996-11-13 |
Family
ID=16678302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2215791A Expired - Lifetime JP2554287B2 (en) | 1990-08-17 | 1990-08-17 | Automatic reset type smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554287B2 (en) |
-
1990
- 1990-08-17 JP JP2215791A patent/JP2554287B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2554287B2 (en) | 1996-11-13 |
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