JPS5929273Y2 - Separate dimming type smoke detector - Google Patents
Separate dimming type smoke detectorInfo
- Publication number
- JPS5929273Y2 JPS5929273Y2 JP2593280U JP2593280U JPS5929273Y2 JP S5929273 Y2 JPS5929273 Y2 JP S5929273Y2 JP 2593280 U JP2593280 U JP 2593280U JP 2593280 U JP2593280 U JP 2593280U JP S5929273 Y2 JPS5929273 Y2 JP S5929273Y2
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- Japan
- Prior art keywords
- power supply
- light emitting
- circuit
- light
- power
- 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.)
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Description
【考案の詳細な説明】
本考案は、受光部側から間歇的に供給される電源電荷を
発光部にて充電し、電源供給遮断時に該充電電荷を利用
して光源を駆動する方式の分離型減光式煙感知器に関す
る。[Detailed description of the invention] This invention is a separate type in which the light emitting part is charged with power supply charges that are intermittently supplied from the light receiving part side, and the charged charges are used to drive the light source when the power supply is cut off. Regarding dimming type smoke detectors.
分離型減光式煙感知器は、受光部と発光部とが分離設置
され、両者間で電源及び同期信号を送受することにより
発光部の光源を駆動させ、煙の感知を行なう。In a separate dimming type smoke detector, a light receiving part and a light emitting part are installed separately, and a power source and a synchronization signal are transmitted and received between the two to drive the light source of the light emitting part and detect smoke.
ところが、この種の煙感知器は、倉庫等に設置され、発
光部と受光部との間が百メートル近くにもなることがあ
り、設置等の関係上両者間の線路数を少なくすることが
要請され、又、受光部側から発光部側への電源供給につ
いても、線路抵抗が無視できない大きさとなるという問
題がある。However, this type of smoke detector is installed in warehouses, etc., and the distance between the light emitting part and the light receiving part can be nearly 100 meters, so it is necessary to reduce the number of lines between the two for installation reasons. Furthermore, there is a problem in that the line resistance becomes too large to be ignored when power is supplied from the light-receiving section to the light-emitting section.
そこで、第１図に示すような方式の分離型減光式煙感知
器が考えられている。Therefore, a separate dimming type smoke detector of the type shown in FIG. 1 has been considered.
この煙感知器は、電源線５，５で接続される受光部Ａと
発光部Ｂとから成り、受光部Ａには、間歇電源供給回路
１と、光電変換回路２と、信号処理回路３と、電源４と
を備え、発光部Ｂには、逆流防止ダイオード６と、光源
駆動用のコンデンサ７と、光源の発光ダイオード８と、
スイッチングトランジスタ９と、発振回路１０と、電源
供給判別回路１１と、発振回路１０及び電源供給判別回
路１１を駆動するコンデンサ１２と、電流制限抵抗１３
とを備えて成るものである。This smoke detector consists of a light receiving part A and a light emitting part B connected by power lines 5, 5, and the light receiving part A includes an intermittent power supply circuit 1, a photoelectric conversion circuit 2, a signal processing circuit 3, and a light receiving part A. , a power source 4, and the light emitting unit B includes a backflow prevention diode 6, a light source driving capacitor 7, a light source light emitting diode 8,
A switching transistor 9, an oscillation circuit 10, a power supply determination circuit 11, a capacitor 12 for driving the oscillation circuit 10 and the power supply determination circuit 11, and a current limiting resistor 13.
It is made up of the following.
そして、この煙感知器は、受光部Ａから発光部Ｂに対し
、間歇電源供給回路１より一定の周期で間歇的に電源電
荷を供給してコンデンサ７及び１２を充電し、電源供給
遮断時にこれらのコンデンサ７．１２から電力を供給す
ると共に、発振回路１０によりスイッチングトランジス
タ９を一定周期で断続的に導通させて、コンデンサ７の
電荷により発光ダイオード８を間歇的且つ断続的に発光
させ、この断続光を受光部Ａの光電変換回路２により電
気信号に変換し、信号処理回路３にて上記間歇電源供給
回路１の間歇電源供給の遮断に同期して該電気信号を処
理し、煙の有無を検出する。In this smoke detector, the intermittent power supply circuit 1 intermittently supplies a power supply charge from the light receiving part A to the light emitting part B at a constant cycle to charge the capacitors 7 and 12, and when the power supply is cut off, the capacitors 7 and 12 are charged. In addition to supplying power from the capacitors 7 and 12, the oscillation circuit 10 makes the switching transistor 9 conductive intermittently at a constant period, and the electric charge in the capacitor 7 causes the light emitting diode 8 to emit light intermittently and intermittently. The light is converted into an electric signal by the photoelectric conversion circuit 2 of the light receiving part A, and the electric signal is processed by the signal processing circuit 3 in synchronization with the interruption of the intermittent power supply of the intermittent power supply circuit 1 to detect the presence or absence of smoke. To detect.
しかし、上記第１図に示す煙感知器は、電源線５．５０
線間容量が大きいと、間歇電源供給回路１の電源供給が
遮断しても、線間電圧は路線間容量Ｃｏ及び受光部Ａの
出力容量との並列容量と発光部Ｂのインピーダンスとの
積で定まる時定数で低下するため、電源供給判別回路１
１による電源供給遮断の検出の遅れを生じる。However, the smoke detector shown in Figure 1 above has a power line of 5.50
If the line capacitance is large, even if the power supply to the intermittent power supply circuit 1 is cut off, the line voltage will be the product of the line capacitance Co, the parallel capacitance with the output capacitance of the light receiving part A, and the impedance of the light emitting part B. Since it decreases with a fixed time constant, the power supply determination circuit 1
1 causes a delay in detecting power supply interruption.
この遅れは、電流制限抵抗１３の抵抗値が大きい程、又
、電源線５．５が長距離になる程線間容量Ｃｏが増大し
て大きくなる。This delay increases as the resistance value of the current limiting resistor 13 increases and as the power line 5.5 becomes longer, the line capacitance Co increases.
その結果、第２図に示すように、電源供給パルスＡの立
下り後、上記時定数によって定まる時間遅延して発光ダ
イオード８が発光しく同図Ｂ）、したがってコンデンサ
１も遅れて放電することになる（同図Ｃ）。As a result, as shown in FIG. 2, after the power supply pulse A falls, the light emitting diode 8 emits light with a time delay determined by the above-mentioned time constant (FIG. 2B), and therefore the capacitor 1 also discharges with a delay. (Figure C).
そのため、この煙感知器は、受光部Ａの信号処理回路３
のゲートを開く時間が長く必要となり耐雑音特性が悪化
するほか、発光パルス数が減少してしまうという欠点を
生じ、実用上問題となっている。Therefore, in this smoke detector, the signal processing circuit 3 of the light receiving part A
It requires a long time to open the gate, which deteriorates noise resistance and reduces the number of light emission pulses, which is a practical problem.
本考案は、斯かる問題点を解決すべくなされたもので、
発光部への電源供給遮断時に電源線の線間容量を放電さ
せることにより、発光部光源の発光開始遅延を最小限と
して、発光パルス数を減少させることなく光源を間歇的
且つ断続的に発光し得る分離型減光式煙感知器を提供す
ることを目的とする。This invention was made to solve such problems,
By discharging the line capacitance of the power line when the power supply to the light emitting unit is cut off, the delay in the start of light emission of the light source of the light emitting unit is minimized, and the light source can emit light intermittently and intermittently without reducing the number of light emission pulses. The purpose of the present invention is to provide a separate type dimming type smoke detector that can be obtained.
本考案は、斯かる目的を達成するため、発光部への電源
線に通じる受光部電源出力端に短絡回路を設け、該短絡
回路を、間歇電源供給回路が発光部への電源供給を遮断
した時のみ上記電源線の線間な低インピーダンスにして
線間容量の電荷を放電させるように構成して成るもので
あって、以下、本考案を図面を参照して説明する。In order to achieve such an objective, the present invention provides a short circuit at the power output terminal of the light receiving section leading to the power line to the light emitting section, and an intermittent power supply circuit cuts off the power supply to the light emitting section through the short circuit. The present invention will be described below with reference to the drawings.
第３図は、本考案の煙感知器の一実施例を示す回路図で
ある。FIG. 3 is a circuit diagram showing an embodiment of the smoke detector of the present invention.
同図において本考案の煙感知器は、電源線５，５で接続
される受光部Ａと発光部Ｂとから成り、受光部Ａは、間
歇電源供給回路１と、光電変換回路２と、信号処理回路
３と、電源４と、短絡回路１４とを備えて成り、発光部
Ｂは、逆流防止ダイオード６と、光源駆動用のコンデン
サγと、光源の発光ダイオード８と、スイッチングトラ
ンジスタ９と、発振回路１０と、電源供給判別回路１１
と、この両回路ＩＱ、１１駆動用のコンデンサ１２と、
電流制限抵抗１３とを備えて成るものである。In the figure, the smoke detector of the present invention consists of a light receiving part A and a light emitting part B connected by power lines 5, 5, and the light receiving part A is connected to an intermittent power supply circuit 1, a photoelectric conversion circuit 2, and a signal The light emitting section B includes a processing circuit 3, a power source 4, and a short circuit 14, and the light emitting section B includes a backflow prevention diode 6, a capacitor γ for driving the light source, a light emitting diode 8 as a light source, a switching transistor 9, and an oscillating circuit. Circuit 10 and power supply determination circuit 11
and a capacitor 12 for driving both circuits IQ and 11,
The current limiting resistor 13 is also provided.
上記短絡回路１４ば、発光部Ｂへの電源線５゜５に通じ
る受光部Ａの電源出力端１５．１５に設けられ、間歇電
源供給回路１の電源供給遮断と同期して電源線５，５間
を低インピーダンスにして、線間容量Ｃｏの電荷を短時
間で放電させるもので、例えば同図に示すように、スイ
ッチングトランジスタ１６を適当な保護抵抗を介して電
源出力端１５．１５に接続して構成される。The short circuit 14 is provided at the power output terminal 15.15 of the light receiving section A leading to the power supply line 5. For example, as shown in the figure, the switching transistor 16 is connected to the power supply output terminal 15.15 through a suitable protective resistor. It consists of
勿論、この短絡回路１４は、同様に機能し得る他の回路
によっても構成できるものである。Of course, this short circuit 14 can also be constituted by other circuits that can function similarly.
上記間歇電源供給回路１は、例えば、同図において図示
しないパルス発生回路とスイッチ回路とから成り、該パ
ルス発生回路のパルス間隔に同期して電源４から電荷を
電源線５を介して発光部Ｂに送り込むものである。The intermittent power supply circuit 1 includes, for example, a pulse generation circuit and a switch circuit (not shown in the figure), and supplies charges from a power source 4 to a light emitting unit B via a power line 5 in synchronization with the pulse interval of the pulse generation circuit. It is sent to
又、このパルス発生回路から電源供給遮断に同期する信
号が取出され、上記スイッチングトランジスタ１６のベ
ースに入力される。Further, a signal synchronized with the cutoff of the power supply is taken out from this pulse generating circuit and inputted to the base of the switching transistor 16.
なお、受光部Ａを構成する他の回路及び発光部Ｂは、上
記第１図に示すものと同様に構成され、その機能も全く
同じであるから説明を省略する。Note that the other circuits constituting the light receiving section A and the light emitting section B are constructed in the same manner as shown in FIG.
このような構成において、間歇電源供給回路１の電源供
給遮断に同期する信号が与えられると、該トランジスタ
１６が導通して電源線５，５が導通し、線間容量Ｃｏの
電荷を放電する。In such a configuration, when a signal synchronized with the interruption of the power supply of the intermittent power supply circuit 1 is applied, the transistor 16 becomes conductive, the power supply lines 5, 5 become conductive, and the charge in the line capacitance Co is discharged.
この放電により電源線５，５間が所定電圧以下となると
、例えばインバータ等で構成される電源供給判別回路１
１により電源供給の遮断が検出されて、発振回路１０が
起動し、スイッチングトランジスタ９を断続的に導通さ
せる。When the voltage between the power lines 5 and 5 becomes lower than a predetermined voltage due to this discharge, a power supply determination circuit 1 comprising, for example, an inverter, etc.
1 detects that the power supply is cut off, the oscillation circuit 10 is started, and the switching transistor 9 is made conductive intermittently.
その結果、発光ダイオード８が、コンデンサ７の電荷を
電源として断続的に発光することになる。As a result, the light emitting diode 8 intermittently emits light using the charge of the capacitor 7 as a power source.
この場合、短絡回路１４の導通時のインピーダンスを十
分小さく選ぶことにより時定数が小さくなり、短時間で
電荷を放電できるため、電源供給遮断後直ちに発振回路
１０が起動し、発光ダイオード８も直ちに発光を開始で
きる。In this case, by selecting a sufficiently small impedance when the short circuit 14 conducts, the time constant becomes small and the charge can be discharged in a short time, so the oscillation circuit 10 starts immediately after the power supply is cut off, and the light emitting diode 8 also starts emitting light immediately. can be started.
上記煙感知器における各部の信号波形を第４図に示す。FIG. 4 shows signal waveforms at various parts of the smoke detector.
同図Ａは、間歇電源供給回路１内のパルス発生回路から
出力されるパルスを示し、同図Ｂは、上記Ａのパルスに
同期して、これと逆位相で間歇的に間歇電源供給回路１
から出力される電源電圧パルスを示す。A in the same figure shows a pulse output from the pulse generation circuit in the intermittent power supply circuit 1, and B in the same figure shows a pulse outputted from the pulse generation circuit in the intermittent power supply circuit 1 in synchronization with the pulse in the above A and in an opposite phase to the pulse in the intermittent power supply circuit 1.
shows the power supply voltage pulse output from the
同図Ｃは、上記Ａのパルスに同期して間歇的に発光する
発光ダイオード８の発光パルスで、上記第２図Ｂに示す
ものと異なり発光開始の遅延がほとんどなく、従ってパ
ルス数も減少しない。C in the same figure shows a light emitting pulse of the light emitting diode 8 that emits light intermittently in synchronization with the pulse in A above, and unlike the one shown in FIG. .
又、同図りは、光源駆動用のコンデンサ７の端子電圧の
変化を示すもので、これも第２図Ｃに示すものと異なり
放電開始がほとんど遅延しない。Further, the same figure shows the change in the terminal voltage of the capacitor 7 for driving the light source, and unlike the one shown in FIG. 2C, there is almost no delay in the start of discharge.
次に、第５図に示す本考案の他の実施例について説明す
る。Next, another embodiment of the present invention shown in FIG. 5 will be described.
同図に示す煙感知器は、受光部Ａの電源出力端１５．１
５に設けられる短絡回路１４を、間歇電源供給回路１に
付加して設けたものである。The smoke detector shown in the figure has a power output terminal 15.1 of the light receiving part A.
5 is provided in addition to the intermittent power supply circuit 1.
この間歇電源供給回路１は、電源線５に対して直列に接
続されるトランジスタ１７と、このトランジスタ１７を
オンオフ駆動するトランジスタ１８と、該トランジスタ
１８を間歇的に導通させるパルス発生回路１９とを有し
て構成される。The intermittent power supply circuit 1 includes a transistor 17 connected in series to the power supply line 5, a transistor 18 that turns on and off the transistor 17, and a pulse generation circuit 19 that makes the transistor 18 conductive intermittently. It is composed of
短絡回路１４は、電源出力端と上記トランジスタ１８と
をダイオード２０及び適当な保護抵抗２１により結んで
構成される。The short circuit 14 is constructed by connecting the power supply output terminal and the transistor 18 through a diode 20 and a suitable protective resistor 21.
この実施例によれば、上記第４図のタイムチャートに示
すように、パルス発生回路１９の出力がオフであると、
トランジスタ１８が非導通状態となり、トランジスタ１
７が導通し）電源４から発光部Ｂのコンデンサ７に電荷
を供給する。According to this embodiment, as shown in the time chart of FIG. 4 above, when the output of the pulse generation circuit 19 is off,
Transistor 18 becomes non-conductive and transistor 1
7 becomes conductive) Charge is supplied from the power source 4 to the capacitor 7 of the light emitting section B.
パルス発生回路１９からパルスが出力されると、上記と
逆にトランジスタ１８が導通し、トランジスタ１７が非
導通となる。When a pulse is output from the pulse generating circuit 19, the transistor 18 becomes conductive and the transistor 17 becomes non-conductive, contrary to the above.
その結果、電源供給が遮断されると共に、電源線５の線
間容量Ｃｏの電荷がダイオード２０、抵抗２１、トラン
ジスタ１８を通して放電される。As a result, the power supply is cut off, and the charge in the line capacitance Co of the power supply line 5 is discharged through the diode 20, the resistor 21, and the transistor 18.
そして、上記第３図に示す実施例と同様に発光ダイオー
ド８の発光が開始され、第４図Ｃに示すような発光パル
スを得ることができる。Then, similarly to the embodiment shown in FIG. 3, the light emitting diode 8 starts emitting light, and a light emission pulse as shown in FIG. 4C can be obtained.
この時、抵抗２２を介して流入する電源４からの電流は
、ダイオード２０に阻止され、発光部Ｂ側には送出され
ない。At this time, the current from the power source 4 flowing through the resistor 22 is blocked by the diode 20 and is not sent to the light emitting section B side.
なお、パルス発生回路１９からの出力パルスは、トラン
ジスタ１８を駆動すると同時に、信号処理回路３に同期
信号を供給するためのものである。Note that the output pulse from the pulse generation circuit 19 is for driving the transistor 18 and at the same time supplying a synchronizing signal to the signal processing circuit 3.
上記各実施例共、発光部Ｂにおしてコンデンサ７に至る
線路中に逆流防止用のダイオード６を挿入接続している
ため、短絡回路１４により電源線５．５間を低インピー
ダンスにしてもコンデンサ７が逆流放電することはない
。In each of the above embodiments, the diode 6 for backflow prevention is inserted and connected in the line leading to the capacitor 7 in the light emitting part B, so even if the impedance between the power lines 5 and 5 is made low by the short circuit 14, the capacitor 7 There will be no backflow discharge.
以上説明したように、本考案は、発光部への電源供給時
に電源線の線間容量を放電させることにより、発光部光
源の発光開始の遅延を最少限に押えて、発光パルス数を
減少させることなく光源を間歇的且つ断続的に発光し得
る効果がある。As explained above, the present invention minimizes the delay in the start of light emission of the light source of the light emitting part and reduces the number of light emission pulses by discharging the line capacitance of the power line when power is supplied to the light emitting part. This has the effect of allowing the light source to emit light intermittently and intermittently without causing any problems.
又、本考案は、短絡回路が低インピーダンスの時のみ光
源が駆動されることになるため、光源駆動時の線路イン
ピーダンスが極めて低くなり、且つ、信号処理回路のゲ
ートを開いている時間が短くて済むため、耐雑音特性も
向上する効果がある。In addition, in the present invention, the light source is driven only when the short circuit has low impedance, so the line impedance when driving the light source is extremely low, and the time the gate of the signal processing circuit is open is short. This has the effect of improving noise resistance.
第１図は分離型減光式煙感知器の構成を示す回路図、第
２図は上記煙感知器の各部の信号波形を示すタイムチャ
ート、第３図は本考案分離型減光式煙感知器の一実施例
を示す回路図、第４図は上記実施例の各部の信号波形を
示すタイムチャート、第５図は本考案煙感知器の他の実
施例を示す回路図である。
１・・・間歇電源供給回路、２・・・光電変換回路、３
・・・信号処理回路、４・・・電源、５・・・電源線、
６・・・逆流防止ダイオード、７・・・光源駆動用のコ
ンデンサ、８・・・発光ダイオード、９・・・スイッチ
ングトランジスタ、１０・・・発振回路、１１・・・電
源供給判別回路、１４・・・短絡回路、１５・・・電源
出力端、１６・・・スイッチングトランジスタ、１γ・
１８・・・トランジスタ、１９・・・パルス発生回路、
２０・・・ダイオード。Figure 1 is a circuit diagram showing the configuration of the separate type attenuated smoke detector, Figure 2 is a time chart showing the signal waveforms of each part of the smoke detector, and Figure 3 is the separated type attenuated smoke detector of the present invention. FIG. 4 is a time chart showing signal waveforms of each part of the above embodiment, and FIG. 5 is a circuit diagram showing another embodiment of the smoke detector of the present invention. 1... Intermittent power supply circuit, 2... Photoelectric conversion circuit, 3
... Signal processing circuit, 4... Power supply, 5... Power supply line,
6... Backflow prevention diode, 7... Capacitor for driving light source, 8... Light emitting diode, 9... Switching transistor, 10... Oscillation circuit, 11... Power supply determination circuit, 14. ...Short circuit, 15...Power output terminal, 16...Switching transistor, 1γ・
18...Transistor, 19...Pulse generation circuit,
20...Diode.
Claims (1)
電源供給を２本の電源線を介して受光部の間歇電源供給
回路より間歇的に行なし）発光部では、電源供給時に上
記間歇供給される電荷を逆流防止ダイオードを介してコ
ンデンサに充電シ、電源供給遮断時に上記コンデンサの
充電電荷を利用して光源を駆動する分離型減光式煙感知
器において、 上記受光部の電源出力端に短絡回路を設けて成り、該短
絡回路は、上記間歇電源供給回路が発光部への電源供給
を遮断した時のみ上記電源線の線間を低インピーダンス
にして、線間容量の電荷を放電させるよう構成して成る
ことを特徴とする分離型減光式煙感知器。[Claim for Utility Model Registration] Consisting of a light emitting part and a light receiving part located separately, power is supplied to the light emitting part intermittently from an intermittent power supply circuit of the light receiving part via two power lines) In the light emitting part, the capacitor is charged with the charge intermittently supplied when power is supplied through a backflow prevention diode, and when the power supply is cut off, the charge in the capacitor is used to drive the light source. A short circuit is provided at the power output end of the light receiving section, and the short circuit makes the impedance between the power lines low only when the intermittent power supply circuit cuts off the power supply to the light emitting section. , a separate dimming type smoke detector characterized in that it is configured to discharge the electric charge of the line capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2593280U JPS5929273Y2 (en) | 1980-02-29 | 1980-02-29 | Separate dimming type smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2593280U JPS5929273Y2 (en) | 1980-02-29 | 1980-02-29 | Separate dimming type smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56128557U JPS56128557U (en) | 1981-09-30 |
| JPS5929273Y2 true JPS5929273Y2 (en) | 1984-08-22 |
Family
ID=29621954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2593280U Expired JPS5929273Y2 (en) | 1980-02-29 | 1980-02-29 | Separate dimming type smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5929273Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60192092U (en) * | 1984-05-25 | 1985-12-20 | 松下電工株式会社 | Dimming smoke detector |
| JPS60250231A (en) * | 1984-05-25 | 1985-12-10 | Matsushita Electric Works Ltd | Projective and receiving light sensor |
-
1980
- 1980-02-29 JP JP2593280U patent/JPS5929273Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56128557U (en) | 1981-09-30 |
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