JP2009036562A - Smoke sensor - Google Patents

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JP2009036562A
JP2009036562A JP2007199327A JP2007199327A JP2009036562A JP 2009036562 A JP2009036562 A JP 2009036562A JP 2007199327 A JP2007199327 A JP 2007199327A JP 2007199327 A JP2007199327 A JP 2007199327A JP 2009036562 A JP2009036562 A JP 2009036562A
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circuit
reference potential
light
smoke detector
smoke
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JP5243742B2 (en
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Eisei Morita
英聖 森田
Makoto Masuyama
誠 増山
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Nohmi Bosai Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a smoke sensor capable of stabilizing the reference potential of an amplifying circuit and the temperature detecting function. <P>SOLUTION: In the smoke sensor equipped with a light emitting element for emitting light to a smoke detecting part, a light receiving element for detecting the scattered light generated by scattering the light of the light emitting element by smoke particles in the smoke detecting part, the amplifying circuit for amplifying the output signal of the light receiving element, the reference potential forming circuit of the amplifying circuit and the A/D conversion part of CPU for detecting temperature, a buffer circuit is provided between the output terminal of the reference potential forming circuit and a circuit for using the reference potential outputted by the reference potential forming circuit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、煙感知器に関する。
The present invention relates to a smoke detector.

図２は、従来の煙感知器２００を示す回路図である。   FIG. 2 is a circuit diagram illustrating a conventional smoke detector 200.

従来の煙感知器２００は、電源Ｂ１と、基準電位生成回路１０と、信号制御回路６０と、オペアンプＯＰ１と、抵抗Ｒ２、Ｒ３と、ＬＥＤ駆動回路３０と、ＣＰＵのＡ／Ｄ変換部４０と、受光素子５０と、増幅回路ＡＭＰ１とを有する。
特許第３２６７１８４号公報 The conventional smoke detector 200 includes a power source B1, a reference potential generation circuit 10, a signal control circuit 60, an operational amplifier OP1, resistors R2 and R3, an LED drive circuit 30, and an A / D conversion unit 40 of the CPU. The light receiving element 50 and the amplifier circuit AMP1.
Japanese Patent No. 3267184

従来の煙感知器２００において、受光素子５０が得た信号を増幅する際に、基準電位が必要であり、基準電位生成回路１０が、抵抗Ｒ１とダイオードＤ１とを使用して、基準電位Ｖ１を形成する。この場合、増幅回路ＡＭＰ１に流れ込む電流によって、基準電位Ｖ１が変動し、増幅回路ＡＭＰ１で増幅された信号に、上記基準電位Ｖ１の変動によるノイズが混入するという問題がある。   In the conventional smoke detector 200, when a signal obtained by the light receiving element 50 is amplified, a reference potential is required, and the reference potential generation circuit 10 uses the resistor R1 and the diode D1 to set the reference potential V1. Form. In this case, there is a problem that the reference potential V1 varies due to the current flowing into the amplifier circuit AMP1, and noise due to the variation of the reference potential V1 is mixed in the signal amplified by the amplifier circuit AMP1.

また、温度を検出する場合、ＣＰＵのＡ／Ｄ変換部４０が、基準電位Ｖ１を入力し、ＣＰＵのＡ／Ｄ変換部４０が変換した電圧に基づいて、温度を測定する。   When detecting the temperature, the A / D conversion unit 40 of the CPU inputs the reference potential V1 and measures the temperature based on the voltage converted by the A / D conversion unit 40 of the CPU.

しかし、ＣＰＵのＡ／Ｄ変換部４０がＡ／Ｄ変換する際に、上記ＣＰＵに電流が流れるので、基準電位Ｖ１が変化し、この基準電位Ｖ１が変化することによって、検出された温度の精度が低下するという問題がある。   However, since the current flows through the CPU when the A / D conversion unit 40 of the CPU performs A / D conversion, the reference potential V1 changes, and the accuracy of the detected temperature is changed by changing the reference potential V1. There is a problem that decreases.

つまり、上記従来例では、増幅回路の基準電位を安定化することができず、また、温度検出機能を安定化することができないという問題がある。   That is, the above conventional example has a problem that the reference potential of the amplifier circuit cannot be stabilized and the temperature detection function cannot be stabilized.

本発明は、増幅回路の基準電位と温度検出機能とを安定化することができる煙感知器を提供することを目的とする。
An object of this invention is to provide the smoke detector which can stabilize the reference electric potential and temperature detection function of an amplifier circuit.

本発明は、検煙部に向けて発光する発光素子と、上記発光素子の光が上記検煙部内の煙粒子によって発生した散乱光を受光する受光素子と、上記受光素子の出力信号を増幅する増幅回路と、上記増幅回路の基準電位生成回路と、温度検出するＣＰＵのＡ／Ｄ変換部とを具備する煙感知器において、上記基準電位生成回路の出力端子と、上記基準電位生成回路が出力する基準電位を使用する回路との間に、バッファ回路が設けられている煙感知器である。
The present invention provides a light emitting element that emits light toward a smoke detector, a light receiving element that receives light scattered by smoke particles in the smoke detector, and a light output from the light receiving element. In a smoke detector including an amplifier circuit, a reference potential generation circuit of the amplifier circuit, and an A / D converter of a CPU for detecting temperature, an output terminal of the reference potential generation circuit and the reference potential generation circuit output The smoke detector is provided with a buffer circuit between the reference potential and the circuit using the reference potential.

本発明によれば、基準電位生成回路が出力する基準電位が、バッファ回路を経由し、バッファ回路の出力インピーダンスが低いので、増幅回路の基準電位が安定し、また、温度検出回路の動作が安定するので、温度検出機能が安定するという効果を奏する。
According to the present invention, since the reference potential output from the reference potential generation circuit passes through the buffer circuit and the output impedance of the buffer circuit is low, the reference potential of the amplifier circuit is stable, and the operation of the temperature detection circuit is stable. As a result, the temperature detection function is stabilized.

発明を実施するための最良の形態は、以下の実施例である。   The best mode for carrying out the invention is the following examples.

図１は、本発明の実施例１である煙感知器１００の要部を示す回路図である。   FIG. 1 is a circuit diagram illustrating a main part of a smoke detector 100 according to a first embodiment of the present invention.

煙感知器１００は、電源Ｂ１と、基準電位生成回路１０と、バッファ回路２０と、オペアンプＯＰ１と、抵抗Ｒ２、Ｒ３と、ＬＥＤ駆動回路３０と、ＣＰＵのＡ／Ｄ変換部４０と、受光素子５０と、信号制御回路６０と、増幅回路ＡＭＰ１とを有する。   The smoke detector 100 includes a power supply B1, a reference potential generation circuit 10, a buffer circuit 20, an operational amplifier OP1, resistors R2 and R3, an LED drive circuit 30, an A / D conversion unit 40 of a CPU, and a light receiving element. 50, a signal control circuit 60, and an amplifier circuit AMP1.

基準電位生成回路１０は、抵抗Ｒ１と、ダイオードＤ１とを有する。抵抗Ｒ１とダイオードＤ１とは直列接続され、抵抗Ｒ１の一端が電源Ｂ１に接続され、抵抗Ｒ１の他端がダイオードＤ１のアノードとが接続され、抵抗Ｒ１とダイオードＤ１のアノードとの接続点が、基準電位生成回路１０の出力端子１１であり、この出力端子１１に基準電位Ｖ１が出力される。   The reference potential generation circuit 10 includes a resistor R1 and a diode D1. The resistor R1 and the diode D1 are connected in series, one end of the resistor R1 is connected to the power supply B1, the other end of the resistor R1 is connected to the anode of the diode D1, and the connection point between the resistor R1 and the anode of the diode D1 is This is an output terminal 11 of the reference potential generation circuit 10, and the reference potential V 1 is output to this output terminal 11.

バッファ回路２０は、オペアンプＯＰ２と、抵抗Ｒ２１と、抵抗Ｒ３１とを有する。オペアンプＯＰ２は、その＋入力端子が基準電位生成回路１０の出力端子１１に接続され、オペアンプＯＰ２の−入力端子が抵抗Ｒ２１を介して、その出力端子に接続されている。   The buffer circuit 20 includes an operational amplifier OP2, a resistor R21, and a resistor R31. The operational amplifier OP2 has a positive input terminal connected to the output terminal 11 of the reference potential generation circuit 10, and a negative input terminal of the operational amplifier OP2 connected to the output terminal via the resistor R21.

信号制御回路６０は、ＣＰＵからの発光制御信号に同期して、パルス状の信号を出力する回路であり、上記パルスの波高値は、安定化されている。   The signal control circuit 60 is a circuit that outputs a pulsed signal in synchronization with the light emission control signal from the CPU, and the peak value of the pulse is stabilized.

オペアンプＯＰ１の＋端子と、オペアンプＯＰ２の出力端子との間に、信号制御回路６０が接続されている。オペアンプＯＰ１の−端子とその出力端子との間に、抵抗Ｒ２が接続されている。オペアンプＯＰ１の出力端子に、ＬＥＤ駆動回路３０が接続されている。オペアンプＯＰ１の−端子とオペアンプＯＰ２の出力端子との間に、抵抗Ｒ３が接続されている。   A signal control circuit 60 is connected between the + terminal of the operational amplifier OP1 and the output terminal of the operational amplifier OP2. A resistor R2 is connected between the negative terminal of the operational amplifier OP1 and its output terminal. The LED drive circuit 30 is connected to the output terminal of the operational amplifier OP1. A resistor R3 is connected between the negative terminal of the operational amplifier OP1 and the output terminal of the operational amplifier OP2.

バッファ回路２０の出力端子に、基準電位Ｖ２が発生する。この基準電位Ｖ２が、増幅回路ＡＭＰ１、ＣＰＵのＡ／Ｄ変換部４０に供給される。   A reference potential V2 is generated at the output terminal of the buffer circuit 20. This reference potential V2 is supplied to the amplifier circuit AMP1 and the A / D converter 40 of the CPU.

また、オペアンプＯＰ２の出力端子が、増幅回路ＡＭＰ１の入力端子に接続されている。なお、オペアンプＯＰ２として、その出力インピーダンスが非常に小さいものが使用されている。   The output terminal of the operational amplifier OP2 is connected to the input terminal of the amplifier circuit AMP1. Note that the operational amplifier OP2 has a very low output impedance.

ＬＥＤ駆動回路３０は、バッファ回路２０が出力する基準電位Ｖ２に応じた定電流を発光素子に供給する定電流供給回路の例である。   The LED drive circuit 30 is an example of a constant current supply circuit that supplies a constant current corresponding to the reference potential V2 output from the buffer circuit 20 to the light emitting element.

増幅回路ＡＭＰ１は、受光素子５０の出力信号を増幅する回路である。   The amplifier circuit AMP1 is a circuit that amplifies the output signal of the light receiving element 50.

オペアンプＯＰ２の出力信号が、増幅回路ＡＭＰ１の基準電位として供給される。   An output signal of the operational amplifier OP2 is supplied as a reference potential of the amplifier circuit AMP1.

次に、煙感知器１００の動作について説明する。   Next, the operation of the smoke detector 100 will be described.

ＬＥＤ駆動回路３０が駆動する図示しない発光素子の発光した光が、検煙部に侵入した煙によって散乱光を発生し、この散乱光を、受光素子５０が受光する。受光信号は、増幅回路ＡＭＰ１で増幅され、ＣＰＵで煙検出レベルが閾値を超えると火災判断する。   Light emitted from a light emitting element (not shown) driven by the LED drive circuit 30 generates scattered light by smoke entering the smoke detecting section, and the light receiving element 50 receives the scattered light. The light reception signal is amplified by the amplifier circuit AMP1, and a fire is judged when the smoke detection level exceeds a threshold value by the CPU.

煙感知器１００において、増幅回路ＡＭＰ１の安定性が高い理由について説明する。   The reason why the stability of the amplifier circuit AMP1 is high in the smoke detector 100 will be described.

上記実施例において、オペアンプＯＰ２の出力インピーダンスが非常に小さいので、オペアンプＯＰ２が出力する基準電位が変動せず、したがって、増幅回路ＡＭＰ１の安定性を高めることができる。   In the above embodiment, since the output impedance of the operational amplifier OP2 is very small, the reference potential output from the operational amplifier OP2 does not fluctuate, and therefore the stability of the amplifier circuit AMP1 can be improved.

そして、ＣＰＵのＡ／Ｄ変換部４０に電圧を印加する温度検出タイミングの前に、受光素子５０の出力電圧を増幅する増幅回路ＡＭＰ１に上記基準電位を印加する印加タイミングを設定する。つまり、受光素子５０の出力電圧を増幅する増幅回路ＡＭＰ１に上記基準電位Ｖ２を印加する印加タイミングの後に、ＣＰＵのＡ／Ｄ変換部４０に電圧を印加する温度検出タイミングを設定し、両タイミングが互いに重ならないように設定する。   And before the temperature detection timing which applies a voltage to the A / D conversion part 40 of CPU, the application timing which applies the said reference potential to the amplifier circuit AMP1 which amplifies the output voltage of the light receiving element 50 is set. That is, a temperature detection timing for applying a voltage to the A / D conversion unit 40 of the CPU is set after an application timing for applying the reference potential V2 to the amplifier circuit AMP1 for amplifying the output voltage of the light receiving element 50. Set so that they do not overlap each other.

また、増幅回路ＡＭＰ１を構成するオペアンプのうちで、余りの１段をオペアンプＯＰ２として使用するので、低コスト化が図られる。つまり、複数のオペアンプが収納されるＩＣにおいて、その一部を増幅回路ＡＭＰ１として使用し、残りを、バッファ回路２０のオペアンプＯＰ２として使用することができる。たとえば、４素子入りのオペアンプのうちの３つを増幅回路ＡＭＰ１として使用し、残りの１つを、バッファ回路２０のオペアンプＯＰ２として使用する。   Further, among the operational amplifiers constituting the amplifier circuit AMP1, the remaining one stage is used as the operational amplifier OP2, so that the cost can be reduced. That is, in an IC in which a plurality of operational amplifiers are housed, a part thereof can be used as the amplifier circuit AMP1 and the rest can be used as the operational amplifier OP2 of the buffer circuit 20. For example, three of the four operational amplifiers are used as the amplifier circuit AMP1, and the remaining one is used as the operational amplifier OP2 of the buffer circuit 20.

上記実施例によれば、バッファ回路２０の出力インピーダンスが非常に小さいので、基準電位Ｖ２が変動せず、したがって、増幅回路ＡＭＰ１の安定性を高めることができる。さらに、増幅回路を構成するオペアンプのうち、余りの１段を使用することによって、煙感知器１００の全体でコストダウンすることができる。   According to the above embodiment, since the output impedance of the buffer circuit 20 is very small, the reference potential V2 does not fluctuate, and therefore the stability of the amplifier circuit AMP1 can be improved. Furthermore, the cost of the smoke detector 100 as a whole can be reduced by using the remaining one of the operational amplifiers constituting the amplifier circuit.

また、ダイオードＤ１に電流を流すことによって、オペアンプＯＰ２の＋端子に電圧が印加される。この電圧は、抵抗Ｒ２１と抵抗Ｒ３１との関係によって決定される増幅率により、ある電圧に増幅される。そして、ＣＰＵのＡ／Ｄ変換部４０を使用して温度を測定する際に、Ａ／Ｄ変換時の電流が増加するが、バッファ回路２０を使用することによって、Ａ／Ｄ変換による電圧変動を受けることがない。   Moreover, a voltage is applied to the + terminal of the operational amplifier OP2 by passing a current through the diode D1. This voltage is amplified to a certain voltage by an amplification factor determined by the relationship between the resistor R21 and the resistor R31. When the temperature is measured using the A / D conversion unit 40 of the CPU, the current at the time of A / D conversion increases. By using the buffer circuit 20, voltage fluctuation due to A / D conversion can be reduced. I will not receive it.

つまり、上記実施例によれば、基準電位生成回路１０が出力する基準電位が、バッファ回路２０を経由し、バッファ回路２０の出力インピーダンスが低いので、増幅回路ＡＭＰ１の基準電位が安定し、また、温度検出回路に必要なＣＰＵのＡ／Ｄ４０の動作が安定するので、温度検出機能を高精度化することができる。
That is, according to the above embodiment, the reference potential output from the reference potential generation circuit 10 passes through the buffer circuit 20 and the output impedance of the buffer circuit 20 is low, so that the reference potential of the amplifier circuit AMP1 is stabilized, Since the operation of the CPU A / D 40 necessary for the temperature detection circuit is stabilized, the temperature detection function can be highly accurate.

本発明の実施例１である煙感知器１００の要部を示す回路図である。It is a circuit diagram which shows the principal part of the smoke detector 100 which is Example 1 of this invention. 従来の煙感知器２００を示す回路図である。It is a circuit diagram which shows the conventional smoke detector 200. FIG.

符号の説明Explanation of symbols

１００…煙感知器、
１０…基準電位生成回路、
Ｄ１…ダイオード、
１１…出力端子、
２０…バッファ回路、
ＯＰ２…オペアンプ、
ＯＰ１…オペアンプ、
３０…ＬＥＤ駆動回路、
４０…ＣＰＵのＡ／Ｄ変換部、
５０…受光素子、
６０…信号制御回路、
ＡＭＰ１…増幅回路。 100 ... smoke detector,
10: Reference potential generation circuit,
D1 ... diode,
11: Output terminal,
20: Buffer circuit,
OP2 ... operational amplifier,
OP1 ... operational amplifier,
30 ... LED drive circuit,
40: A / D converter of CPU,
50. Light receiving element,
60 ... Signal control circuit,
AMP1 is an amplifier circuit.

Claims (4)

検煙部に向けて発光する発光素子と、上記発光素子の光が上記検煙部内の煙粒子によって発生した散乱光を受光する受光素子と、上記受光素子の出力信号を増幅する増幅回路と、上記増幅回路の基準電位生成回路と、温度検出するＣＰＵのＡ／Ｄ変換部とを具備する煙感知器において、
上記基準電位生成回路の出力端子と、上記基準電位生成回路が出力する基準電位を使用する回路との間に、バッファ回路が設けられていることを特徴とする煙感知器。 A light-emitting element that emits light toward the smoke detector, a light-receiving element that receives light scattered by smoke particles in the smoke detector, and an amplification circuit that amplifies the output signal of the light-receiving element; In a smoke detector comprising a reference potential generation circuit of the amplifier circuit and an A / D converter of a CPU for detecting temperature,
A smoke detector, wherein a buffer circuit is provided between an output terminal of the reference potential generating circuit and a circuit using the reference potential output from the reference potential generating circuit. 請求項１において、
上記基準電位を使用する回路は、上記増幅回路、上記ＣＰＵのＡ／Ｄ変換部、上記発光素子の駆動回路のうちの少なくとも１つであることを特徴とする煙感知器。 In claim 1,
The smoke detector, wherein the circuit using the reference potential is at least one of the amplifier circuit, the A / D converter of the CPU, and the drive circuit of the light emitting element. 請求項１において、
上記バッファ回路は、オペアンプであることを特徴とする煙感知器。 In claim 1,
The smoke sensor, wherein the buffer circuit is an operational amplifier. 請求項３において、
上記オペアンプの増幅率は、上記Ａ／Ｄ変換部の駆動電流分を生成するに充分な増幅率であることを特徴とする煙感知器。 In claim 3,
The smoke detector, wherein the operational amplifier has an amplification factor sufficient to generate a drive current for the A / D converter.
JP2007199327A 2007-07-31 2007-07-31 smoke detector Active JP5243742B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02108193U (en) * 1989-02-15 1990-08-28
JPH04253300A (en) * 1991-01-29 1992-09-09 Nohmi Bosai Ltd Reference voltage generator for fire alarm facility
JPH06288917A (en) * 1993-03-31 1994-10-18 Nohmi Bosai Ltd Smoke detection type fire sensor
JP2002287833A (en) * 1999-08-06 2002-10-04 Ricoh Co Ltd Constant voltage power source
JP2002358582A (en) * 2001-05-31 2002-12-13 Matsushita Electric Works Ltd Photoelectric type smoke detector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02108193U (en) * 1989-02-15 1990-08-28
JPH04253300A (en) * 1991-01-29 1992-09-09 Nohmi Bosai Ltd Reference voltage generator for fire alarm facility
JPH06288917A (en) * 1993-03-31 1994-10-18 Nohmi Bosai Ltd Smoke detection type fire sensor
JP2002287833A (en) * 1999-08-06 2002-10-04 Ricoh Co Ltd Constant voltage power source
JP2002358582A (en) * 2001-05-31 2002-12-13 Matsushita Electric Works Ltd Photoelectric type smoke detector

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