JPS6118240B2 - - Google Patents
Info
- Publication number
- JPS6118240B2 JPS6118240B2 JP52159460A JP15946077A JPS6118240B2 JP S6118240 B2 JPS6118240 B2 JP S6118240B2 JP 52159460 A JP52159460 A JP 52159460A JP 15946077 A JP15946077 A JP 15946077A JP S6118240 B2 JPS6118240 B2 JP S6118240B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- thyristor
- operational amplifier
- signal
- bridge 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Emergency Alarm Devices (AREA)
- Alarm Systems (AREA)
Description
【発明の詳細な説明】
本発明は、例えばガス漏れ等の異常を感知して
警報信号を発生する異常検出警報装置の改良に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an abnormality detection and alarm device that detects an abnormality such as a gas leak and generates an alarm signal.
従来より、ガス漏れ等の異常を検出して警報を
発生する装置は種々提案されているが、その多く
のものが直流増幅器を使用するものであるため、
オフセツト調整を必要とし、従つて、オフセツト
調整のための時間を必要とし、更には調整ミス等
によつて警報すべきガス濃度が大きくずれ、警報
限界を越えても警報を発しない場合がある等の欠
点があつた。また、オフセツト調整には可変抵抗
器を用いるが、この可変抵抗器の経時特性、耐衝
撃性、耐ガス性等に問題があり、これらの問題を
解決するために密閉型の可変抵抗器を用いるとそ
れがまたコスト上昇につながる等の欠点があつ
た。 Various devices have been proposed to detect abnormalities such as gas leaks and issue alarms, but most of them use DC amplifiers.
Offset adjustment is required, and therefore time is required for offset adjustment.Furthermore, due to adjustment errors, etc., the gas concentration that should be alarmed may deviate greatly, and an alarm may not be issued even if the alarm limit is exceeded. There were some shortcomings. Additionally, a variable resistor is used for offset adjustment, but this variable resistor has problems with its aging characteristics, shock resistance, gas resistance, etc., and to solve these problems, a sealed variable resistor is used. However, it also had drawbacks such as increasing costs.
本発明は、如上のごとき従来技術における欠点
を解決するためになされたもので、以下に図面を
参照しながらその一実施例につき詳細に説明す
る。 The present invention has been made to solve the above-mentioned drawbacks in the prior art, and one embodiment thereof will be described in detail below with reference to the drawings.
第１図において、１は例えば商用の交流電源
で、その出力電圧（第２図ａ参照）はブザー等の
警報器７を通してサイリスタ６のアノード・カソ
ード間に加えられている。また、この交流電源１
の電圧は変成器２を通して所望の大きさの電圧に
逓降されて全波整流回路３および交流ブリツジ回
路４に供給される。全波整流回路３の出力電圧
（第２図ｂ参照）は演算増幅器５の電源として使
用されるとともに抵抗R1とR2によつて分圧され
て反転演算増幅器５の一方の入力端子に供給され
る。一方、交流ブリツジ回路４は少なくともその
一辺に例えばガス等の可燃性ガスに触れることに
よつて電気抵抗が変化するガス感知素子Ｄを含
み、他の一辺には該ガス感知素子Ｄの温度補償用
素子Ｃが接続されている。この交流ブリツジ回路
４は空気中に可燃性ガスが存在しない時つまり正
常状態においては不平衡で、空気中の可燃性ガス
が存在する時つまり異常時にはガス濃度が大きく
なるにつれて逐次平衡状態に近づき、さらに濃度
が増して交流ブリツジ回路４が平衡点を通過する
とその出力電圧の位相が180゜反転するように構
成されている。この交流ブリツジ回路４からの出
力信号は直流分阻止用のコンデンサC1を通して
演算増幅器５の他方の入力端子に供給されるが、
交流ブリツジ回路４の一方の出力端子ｂは抵抗
R1とR2の接続点の電位と共通に保たれているの
で、演算増幅器５の入力信号は抵抗R1とR2とに
よつて分割された基準電位を中心に増減する。従
つて、演算増幅器５の入力信号は、正常時交流ブ
リツジ回路４が平衛していない時は第２図ｃに示
すような信号波形となり、異常時平衡点を通り越
すと第２図ｄに示すような信号波形となつて、演
算増幅器５の出力信号はそれぞれ第２図ｅおよび
ｆに示すようになる。 In FIG. 1, reference numeral 1 denotes, for example, a commercial AC power source, and its output voltage (see FIG. 2a) is applied between the anode and cathode of a thyristor 6 through an alarm 7 such as a buzzer. In addition, this AC power supply 1
The voltage is stepped down to a desired level of voltage through a transformer 2 and supplied to a full-wave rectifier circuit 3 and an AC bridge circuit 4. The output voltage of the full-wave rectifier circuit 3 (see Figure 2b) is used as a power source for the operational amplifier 5, and is divided by resistors R1 and R2 and supplied to one input terminal of the inverting operational amplifier 5. be done. On the other hand, the AC bridge circuit 4 includes a gas sensing element D whose electrical resistance changes when it comes into contact with a flammable gas such as gas on at least one side, and a temperature compensation element for the gas sensing element D on the other side. Element C is connected. This AC bridge circuit 4 is unbalanced when there is no flammable gas in the air, that is, in a normal state, and when there is a flammable gas in the air, that is, in an abnormal state, it gradually approaches an equilibrium state as the gas concentration increases. The configuration is such that when the concentration increases further and the AC bridge circuit 4 passes through an equilibrium point, the phase of its output voltage is reversed by 180°. The output signal from this AC bridge circuit 4 is supplied to the other input terminal of the operational amplifier 5 through the DC blocking capacitor C1 .
One output terminal b of the AC bridge circuit 4 is a resistor.
Since the potential is kept common to the potential at the connection point between R 1 and R 2 , the input signal to the operational amplifier 5 increases or decreases around the reference potential divided by the resistors R 1 and R 2 . Therefore, the input signal to the operational amplifier 5 has a signal waveform as shown in FIG. 2c when the AC bridge circuit 4 is not in normal state, and as shown in FIG. 2d when it passes the equilibrium point in an abnormal state. With such a signal waveform, the output signals of the operational amplifier 5 become as shown in FIG. 2e and f, respectively.
コンデンサC1と抵抗R1によつて決まる演算増
幅器５の増幅度は十分に大きくとつてあるので、
その出力信号は飽和し、演算増幅器５への電源印
加電圧である全波整流回路３の出力電圧（第２図
ｂ）に支配された波形となつている。本実施例で
は全波整流回路３の出力に平滑回路を用いていな
いが、これは装置を小型化するとともにコストダ
ウンを図るためである。平滑回路を用いてもよい
ことはもちろんであり、その場合には演算増幅器
５の出力信号の波形は矩形波となる。 Since the amplification degree of the operational amplifier 5 determined by the capacitor C 1 and the resistor R 1 is set to be sufficiently large,
The output signal is saturated and has a waveform dominated by the output voltage of the full-wave rectifier circuit 3 (FIG. 2b), which is the voltage applied to the operational amplifier 5. In this embodiment, a smoothing circuit is not used for the output of the full-wave rectifier circuit 3, but this is for the purpose of downsizing the device and reducing costs. Of course, a smoothing circuit may be used, and in that case, the waveform of the output signal of the operational amplifier 5 will be a rectangular wave.
この演算増幅器５の出力信号電圧を抵抗R3と
R4とで分圧し、その分圧電圧サイリスタ６の制
御電極に印加すると、サイリスタ６は正常時はア
ノード、カソード間の電圧と制御信号電圧との位
相が逆となるため導通せず、異常時のみ負荷回路
の電圧と制御回路の電圧との位相が一致するため
導通して警報器７を作動する。なお、コンデンサ
C2，C3は雑音除去用コンデンサである。 The output signal voltage of this operational amplifier 5 is connected to the resistor R3 .
When the divided voltage is applied to the control electrode of the thyristor 6, the voltage between the anode and cathode and the control signal voltage are opposite in phase during normal operation, so the thyristor 6 does not conduct, and when abnormal Since the voltage of the load circuit and the voltage of the control circuit match in phase, conduction occurs and the alarm 7 is activated. In addition, the capacitor
C 2 and C 3 are noise removal capacitors.
以上の説明から明らかなように、本発明による
と、演算増幅器を交流増幅器として使用している
ため、オフセツト調整が不要であり、従つて、オ
フセツト調整に要する時間が不要でそのわずらわ
しさがなく、しかもオフセツトの調整ミスによる
誤動作のおそれもない。更には、オフセツト調整
用の可変抵抗器が不要であるため、従来問題の多
かつたこのオフセツト調整用可変抵抗器の経時特
性、耐衝撃性、耐ガス性等の諸対策から解放され
る利点がある。 As is clear from the above description, according to the present invention, since the operational amplifier is used as an AC amplifier, offset adjustment is not necessary.Therefore, the time required for offset adjustment is unnecessary and the troublesomeness thereof is eliminated. Moreover, there is no risk of malfunction due to offset adjustment errors. Furthermore, since there is no need for a variable resistor for offset adjustment, there is an advantage of being freed from various measures such as aging characteristics, impact resistance, gas resistance, etc. of the variable resistor for offset adjustment, which had many problems in the past. be.
さらにまた、異常時には交流ブリツジ回路の出
力電圧の位相が正常時の出力電圧の位相と逆位相
となつて、サイリスタにそのアノード、カソード
間の電圧と同位相の制御信号を送つてサイリスタ
を導通させ、警報器を作動させるようになつてい
るので、簡単な回路でしかも安定した作動を行な
わせることができる利点がある。 Furthermore, when an abnormality occurs, the phase of the output voltage of the AC bridge circuit is opposite to the phase of the output voltage during normal operation, and a control signal having the same phase as the voltage between the anode and cathode of the thyristor is sent to make the thyristor conductive. , which activates the alarm, has the advantage of being able to operate stably with a simple circuit.
第１図は本発明の一実施例を説明するための電
気回路図、第２図は本発明の動作を説明するため
の電気信号波形図である。
１……交流電源、２……変成器、３……整流回
路、４……交流ブリツジ回路、５……演算増幅
器、６……サイリスタ、７……警報器、C1……
直流分阻止用コンデンサ。
FIG. 1 is an electric circuit diagram for explaining an embodiment of the present invention, and FIG. 2 is an electric signal waveform diagram for explaining the operation of the present invention. 1... AC power supply, 2... Transformer, 3... Rectifier circuit, 4... AC bridge circuit, 5... Operational amplifier, 6... Thyristor, 7... Alarm, C 1 ...
DC blocking capacitor.
Claims (1)
流電圧を電源とし少なくとも一辺に感知素子Ｄを
含む交流ブリツジ回路４と、直流分阻止用コンデ
ンサC1と、前記交流ブリツジ回路４からの出力
信号を前記直流分阻止用コンデンサC1を通して
入力信号とする演算増幅器５と、前記交流電源１
からの交流電圧を電源とし前記演算増幅器５から
の出力信号を制御信号とするサイリスタ６と、そ
のサイリスタ６に負荷として接続された警報器７
とを具備し、正常時は前記サイリスタ６のアノー
ド、カソード間電圧と制御信号電圧とを互いに逆
位相として前記サイリスタ６の導通を阻止し、異
常時、前記感知素子Ｄの抵抗が変化して前記交流
ブリツジ４の出力信号電圧の位相を180゜反転せ
しめて前記演算増幅器５の出力も180゜反転せし
め、前記サイリスタ６のアノード、カソード間電
圧と制御信号電圧の位相を同一ならしめ前記サイ
リスタ６を導通せしめて前記サイリスタ６に接続
された前記警報器７を作動するようにしたことを
特徴とする異常検出警報装置。1 an AC power supply circuit 2, an AC bridge circuit 4 using the AC voltage from the AC power supply 2 as a power source and including a sensing element D on at least one side, a DC blocking capacitor C1 , and an output signal from the AC bridge circuit 4. an operational amplifier 5 which receives the signal as an input signal through the DC blocking capacitor C1 , and the AC power supply 1.
a thyristor 6 whose power source is an alternating current voltage from the operational amplifier 5 and whose control signal is an output signal from the operational amplifier 5; and an alarm 7 connected to the thyristor 6 as a load.
In a normal state, the voltage between the anode and cathode of the thyristor 6 and the control signal voltage are set in opposite phases to each other to prevent the thyristor 6 from conducting, and in an abnormal state, the resistance of the sensing element D changes to The phase of the output signal voltage of the AC bridge 4 is inverted by 180 degrees, and the output of the operational amplifier 5 is also inverted by 180 degrees. An abnormality detection and alarm device characterized in that the alarm device 7 connected to the thyristor 6 is activated by making it conductive.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15946077A JPS5492197A (en) | 1977-12-29 | 1977-12-29 | Anomaly detection alarm unit |
| US05/968,469 US4228429A (en) | 1977-12-29 | 1978-12-11 | Alarm system having phase-sensitive bridge circuit |
| DE2856742A DE2856742C2 (en) | 1977-12-29 | 1978-12-29 | Alarm system with an AC power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15946077A JPS5492197A (en) | 1977-12-29 | 1977-12-29 | Anomaly detection alarm unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5492197A JPS5492197A (en) | 1979-07-21 |
| JPS6118240B2 true JPS6118240B2 (en) | 1986-05-12 |
Family
ID=15694238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15946077A Granted JPS5492197A (en) | 1977-12-29 | 1977-12-29 | Anomaly detection alarm unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5492197A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113192U (en) * | 1982-01-27 | 1983-08-02 | リコーエレメックス株式会社 | Detection output circuit for gas leak alarm |
| JPS59138995U (en) * | 1983-03-07 | 1984-09-17 | 松下電器産業株式会社 | Gas leak alarm control device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223560A (en) * | 1975-08-14 | 1977-02-22 | Shiyuraubenkonbinaato Veb | Method of manufacturing high strencth cold formed parts |
-
1977
- 1977-12-29 JP JP15946077A patent/JPS5492197A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223560A (en) * | 1975-08-14 | 1977-02-22 | Shiyuraubenkonbinaato Veb | Method of manufacturing high strencth cold formed parts |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5492197A (en) | 1979-07-21 |
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