JPH053545B2 - - Google Patents
Info
- Publication number
- JPH053545B2 JPH053545B2 JP59183014A JP18301484A JPH053545B2 JP H053545 B2 JPH053545 B2 JP H053545B2 JP 59183014 A JP59183014 A JP 59183014A JP 18301484 A JP18301484 A JP 18301484A JP H053545 B2 JPH053545 B2 JP H053545B2
- Authority
- JP
- Japan
- Prior art keywords
- pair
- electrodes
- switch
- heater
- smoke
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Fire-Detection Mechanisms (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、スイツチ、整流器、定電流回路、
抵抗器等で実現できる小型、軽量な煙・ガス検出
器に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a switch, a rectifier, a constant current circuit,
This invention relates to a small and lightweight smoke/gas detector that can be realized using resistors, etc.
従来の煙・ガス検出器は第１図のように構成さ
れ、第２図の回路で使用されていた。
A conventional smoke/gas detector was constructed as shown in FIG. 1 and used in the circuit shown in FIG.
第１図において、１は煙・ガス検出素子で、互
に隔離された一対のヒータ兼電極３が酸化物半導
体２により一体に固められている。この煙・ガス
検出素子１の煙・ガス検出の感度を上げるため、
一対のヒータ兼電極３により加熱される。また、
これは一度吸着されたガスの脱ガス化も目的とし
ている。酸化物半導体２が効率よく働くためには
温度分布を一様にする必要がある。このためにも
一対のヒータ兼電極３が設けられている。一対の
ヒータ兼電極３の間の抵抗は煙やガス等にさらさ
れていないときには高抵抗の状態である。一旦、
煙やガス等を吸着すると、一対のヒータ兼電極３
間の抵抗が下がり、これを検出することにより、
煙・ガス検出器として動作する。前記内容を第２
図を用いて説明する。 In FIG. 1, reference numeral 1 denotes a smoke/gas detection element, in which a pair of heater-cum-electrodes 3 isolated from each other are integrally solidified with an oxide semiconductor 2. In order to increase the smoke/gas detection sensitivity of this smoke/gas detection element 1,
It is heated by a pair of heater/electrodes 3. Also,
This also aims at degassing the gas once adsorbed. In order for the oxide semiconductor 2 to work efficiently, it is necessary to make the temperature distribution uniform. For this purpose as well, a pair of heater-cum-electrodes 3 is provided. The resistance between the pair of heater/electrodes 3 is in a high resistance state when not exposed to smoke, gas, etc. Once,
When smoke or gas is adsorbed, a pair of heater/electrode 3
By detecting this, the resistance between
Operates as a smoke/gas detector. The above contents in the second
This will be explained using figures.
第２図において、４はトランスで、このトラン
ス４の２次側巻線５，６は一対のヒータ兼電極３
の各々に接続され、加熱用電源として動作する。
そして、一対のヒータ兼電極３の各々の電極間の
電気抵抗を検出する必要があるので、２次側巻線
５，６は分離されて高絶縁状態にされている。直
流電源７を２次側巻線５側に接続し、検出抵抗器
８を他方の２次側巻線５６側に接続する。こうす
ることにより、２次側巻線５，６により一対のヒ
ータ兼電極３が熱せられ、ガス等を吸着したとき
には検出抵抗器８に電圧が発生し、煙やガスの検
出ができる。 In FIG. 2, 4 is a transformer, and the secondary windings 5 and 6 of this transformer 4 are a pair of heater-cum-electrode 3.
It operates as a heating power source.
Since it is necessary to detect the electrical resistance between each electrode of the pair of heater/electrodes 3, the secondary windings 5 and 6 are separated and placed in a highly insulated state. The DC power supply 7 is connected to the secondary winding 5 side, and the detection resistor 8 is connected to the other secondary winding 56 side. By doing so, the pair of heater/electrodes 3 is heated by the secondary windings 5 and 6, and when gas or the like is adsorbed, a voltage is generated in the detection resistor 8, and smoke or gas can be detected.
従来の煙・ガス検出器は第２図のように構成さ
れていたので、トランス４が省略できず、小形、
軽量、安価にすることができない。また、ガス検
出時においてトランス４による交流成分が検出抵
抗器８に影響を与え、高精度の検出が不可能であ
るという欠点があつた。 Conventional smoke/gas detectors were configured as shown in Figure 2, so the transformer 4 could not be omitted, making it compact and
It cannot be made lightweight or cheap. Another disadvantage is that the alternating current component from the transformer 4 affects the detection resistor 8 during gas detection, making highly accurate detection impossible.
この発明は、上記のような従来のものの欠点を
除去するためになされたもので、トランスを使用
せずに、スイツチ、整流器、定電流回路を使用す
ることにより、小型、軽量、安価に煙・ガス検出
器を提供するものである。以下、この発明を図面
を用いて説明する。
This invention was made in order to eliminate the drawbacks of the conventional products as described above. By using a switch, a rectifier, and a constant current circuit without using a transformer, it is possible to reduce smoke by reducing the size, weight, and cost. The present invention provides a gas detector. Hereinafter, this invention will be explained using the drawings.
第３図はこの発明の一実施例である。第４図は
第３図の実施例の動作説明のための波形図であ
る。なお、第３図中第２図と同一符号は同じもの
を示す。
FIG. 3 shows an embodiment of this invention. FIG. 4 is a waveform diagram for explaining the operation of the embodiment shown in FIG. Note that the same reference numerals in FIG. 3 as in FIG. 2 indicate the same things.
第３図において、９は定電流回路、１０は第１
のスイツチ、１１は第１の整流器、１２は第２の
整流器、１３は第２のスイツチ、１４は第３のス
イツチ、１５は第４のスイツチである。直流電源
７、定電流回路９、第１のスイツチ１０を直列に
接続し、これに第１の整流器１１、一対のヒータ
兼電極３の一方の電極、第２のスイツチ１３を直
列接続したものと、第２の整流器１２、一対のヒ
ータ兼電極３の他方の電極、第３のスイツチ１４
を直列接続したものとを並列接続して回路を構成
している。 In Fig. 3, 9 is a constant current circuit, 10 is a first
11 is a first rectifier, 12 is a second rectifier, 13 is a second switch, 14 is a third switch, and 15 is a fourth switch. A DC power supply 7, a constant current circuit 9, and a first switch 10 are connected in series, and a first rectifier 11, one electrode of a pair of heater electrodes 3, and a second switch 13 are connected in series. , the second rectifier 12, the other electrode of the pair of heater/electrodes 3, and the third switch 14
A circuit is constructed by connecting these in series and in parallel.
次に動作について第４図を参照しながら説明す
る。 Next, the operation will be explained with reference to FIG.
第１のスイツチ１０、第２のスイツチ１３、第
３のスイツチ１４をONにし、第４のスイツチ１
５をOFFにしたとき、直流電源７より定電流回
路９により規定された電流が並列接続された一対
のヒータ兼電極３に各々分割されて流れる。これ
により一対のヒータ兼電極３は加熱され、脱ガス
化、およびガスを検知するための高感度化が酸化
物半導体２によつて行われる（第４図の時刻t1〜
t2）。 Turn on the first switch 10, the second switch 13, and the third switch 14, and turn on the fourth switch 1.
5 is turned off, a current regulated by a constant current circuit 9 flows from the DC power supply 7 to each of the pair of heater-electrodes 3 connected in parallel. As a result, the pair of heater/electrodes 3 is heated, and the oxide semiconductor 2 performs degassing and high sensitivity for gas detection (from time t 1 in FIG. 4).
t2 ).
次に第１のスイツチ１０、第２のスイツチ１
３、第３のスイツチ１４をOFFにし、第４のス
イツチ１５をONにすると、ヒータを加熱する定
電流回路９からの供給電流が停止し、第４のスイ
ツチ１５から一対のヒータ兼電極３の一方に電圧
がかかる。このときガスが存在すると、第４図の
ｆのように検出抵抗器８にはガスが検知される。
この値はガス濃度による一対のヒータ兼電極３間
の抵抗と検出抵抗器の分割比となる（第４図の時
刻t3〜t4）。 Next, the first switch 10, the second switch 1
3. When the third switch 14 is turned OFF and the fourth switch 15 is turned ON, the supply current from the constant current circuit 9 that heats the heater is stopped, and the supply current from the fourth switch 15 to the pair of heater-cum-electrodes 3 is stopped. Voltage is applied to one side. If gas is present at this time, the gas is detected by the detection resistor 8 as shown at f in FIG.
This value becomes the division ratio between the resistance between the pair of heater/electrodes 3 and the detection resistor depending on the gas concentration (time t 3 to t 4 in FIG. 4).
また、第１の整流器１１はガス検出時に一対の
ヒータ兼電極３の他方へ直流電源７から直接電流
を流さないようにし、第２の整流器１２は一対の
ヒータ兼電極３の２つの加熱電圧が等しくなるよ
うに第１の整流器１１とバランスをとるために挿
入されている。 Further, the first rectifier 11 prevents current from flowing directly from the DC power supply 7 to the other of the pair of heater/electrodes 3 when gas is detected, and the second rectifier 12 prevents the current from flowing directly from the DC power source 7 to the other of the pair of heater/electrodes 3. They are inserted to balance the first rectifier 11 so that they are equal.
なお、スイツチ類は半導体スイツチを使用し、
第４のスイツチ１５のかわりに抵抗器を使用する
ことも可能である。 In addition, the switches use semiconductor switches,
It is also possible to use a resistor instead of the fourth switch 15.
以上説明したように、この発明は、一体に固め
た酸化物半導体とその中に互に隔離されて埋込ま
れた一対のヒータ兼電極を備えた煙・ガス検出器
において、第１の整流器と前記一対のヒータ兼電
極の一方の電極と第２のスイツチとを直列接続し
たものと、第２の整流器と一対のヒータ兼電極の
他方の電極と第３のスイツチとを直列接続したも
のとを並列に接続した回路を、直流電源と定電流
回路と第１のスイツチとを直列に接続したものに
直列に接続し、前記並列接続された一対のヒータ
兼電極の一方を第４のスイツチを介して直流電源
に接続し、前記一対のヒータ兼電極の他方に流れ
る電流を検出する検出抵抗器を前記一対のヒータ
兼電極の他方に並列に接続した構成としたので、
高価で大型のトランスを用いずに構成でき、交流
電源を使用しないので交流成分の影響がなく高精
度なガス検知が可能となる利点がある。さらに、
また、定電流回路を使用することにより、ガス検
出素子の温度を高精度に制御することが可能とな
り、より一層の高精度検知ができる利点を有す
る。
As explained above, the present invention provides a smoke/gas detector that includes an oxide semiconductor that is solidified into one body and a pair of heaters and electrodes that are embedded in the oxide semiconductor and are isolated from each other. One electrode of the pair of heater-cum-electrodes and a second switch are connected in series, and the second rectifier, the other electrode of the pair of heater-cum-electrodes, and a third switch are connected in series. The parallel-connected circuit is connected in series to a DC power supply, a constant current circuit, and a first switch connected in series, and one of the pair of parallel-connected heaters/electrodes is connected to the circuit through a fourth switch. and a detection resistor for detecting the current flowing through the other of the pair of heaters/electrodes is connected in parallel to the other of the pair of heaters/electrodes.
It can be configured without using an expensive and large transformer, and since it does not use an AC power source, it has the advantage of being able to perform highly accurate gas detection without being affected by AC components. moreover,
Further, by using a constant current circuit, it is possible to control the temperature of the gas detection element with high precision, and there is an advantage that even higher precision detection can be performed.
第１図は従来の煙・ガス検出素子の概略図、第
２図は従来の煙・ガス検出器の回路図、第３図は
この発明の一実施例である煙・ガス検出器の回路
図、第４図は第３図の実施例の動作説明のための
波形図である。
図中、１は煙・ガス検出素子、２は酸化物半導
体、３は一対のヒータ兼電極、７は直流電源、８
は検出抵抗器、９は定電流回路、１０は第１のス
イツチ、１１は第１の整流器、１２は第２の整流
器、１３は第２のスイツチ、１４は第３のスイツ
チ、１５は第４のスイツチである。なお、図中の
同一符号は同一または相当部分を示す。
Figure 1 is a schematic diagram of a conventional smoke/gas detection element, Figure 2 is a circuit diagram of a conventional smoke/gas detector, and Figure 3 is a circuit diagram of a smoke/gas detector that is an embodiment of the present invention. , FIG. 4 is a waveform chart for explaining the operation of the embodiment shown in FIG. In the figure, 1 is a smoke/gas detection element, 2 is an oxide semiconductor, 3 is a pair of heaters and electrodes, 7 is a DC power supply, and 8
is a detection resistor, 9 is a constant current circuit, 10 is a first switch, 11 is a first rectifier, 12 is a second rectifier, 13 is a second switch, 14 is a third switch, and 15 is a fourth switch. It is a switch. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
離されて埋込まれた一対のヒータ兼電極を備えた
煙・ガス検出器において、第１の整流器と前記一
対のヒータ兼電極の一方の電極と第２のスイツチ
とを直列接続したものと、第２の整流器と前記一
対のヒータ兼電極の他方の電極と第３のスイツチ
とを直列接続したものとを並列に接続した回路
を、直流電源と定電流回路と第１のスイツチとを
直列に接続したものに直列に接続し、前記並列接
続された一対のヒータ兼電極の一方を第４のスイ
ツチを介して直流電源に接続し、前記一対のヒー
タ兼電極の他方に流れる電流を検出する検出抵抗
器を前記一対のヒータ兼電極の他方に並列に接続
したことを特徴とする煙・ガス検出器。1. In a smoke/gas detector comprising an integrally solidified oxide semiconductor and a pair of heater-cum-electrodes embedded therein in isolation from each other, a first rectifier and one of the pair of heater-cum-electrodes. DC A power supply, a constant current circuit, and a first switch are connected in series, and one of the pair of parallel-connected heaters/electrodes is connected to a DC power supply via a fourth switch. A smoke/gas detector characterized in that a detection resistor for detecting a current flowing through the other of the pair of heaters/electrodes is connected in parallel to the other of the pair of heaters/electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18301484A JPS6159251A (en) | 1984-08-30 | 1984-08-30 | Smoke/gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18301484A JPS6159251A (en) | 1984-08-30 | 1984-08-30 | Smoke/gas detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6159251A JPS6159251A (en) | 1986-03-26 |
| JPH053545B2 true JPH053545B2 (en) | 1993-01-18 |
Family
ID=16128226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18301484A Granted JPS6159251A (en) | 1984-08-30 | 1984-08-30 | Smoke/gas detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6159251A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55181543U (en) * | 1980-06-18 | 1980-12-26 | ||
| JPS57184961A (en) * | 1981-05-08 | 1982-11-13 | Matsushita Electric Ind Co Ltd | Detecting device |
-
1984
- 1984-08-30 JP JP18301484A patent/JPS6159251A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6159251A (en) | 1986-03-26 |
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