JPH025267B2 - - Google Patents
Info
- Publication number
- JPH025267B2 JPH025267B2 JP17914482A JP17914482A JPH025267B2 JP H025267 B2 JPH025267 B2 JP H025267B2 JP 17914482 A JP17914482 A JP 17914482A JP 17914482 A JP17914482 A JP 17914482A JP H025267 B2 JPH025267 B2 JP H025267B2
- Authority
- JP
- Japan
- Prior art keywords
- bridge circuit
- circuit
- voltage
- series
- resistors
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 description 5
- 208000033707 Early-onset X-linked optic atrophy Diseases 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000025019 optic atrophy 2 Diseases 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【発明の詳細な説明】
湿度検出装置に用いられる抵抗検出型感湿素子
は、吸着した水分子によるプロトン伝導機構（イ
オン伝導）により抵抗値が変化するものと考えら
れており、直流では安定な動作をせず、交流電圧
を必要とする。[Detailed description of the invention] It is believed that the resistance value of the resistance detection type humidity sensing element used in a humidity detection device changes due to a proton conduction mechanism (ion conduction) caused by adsorbed water molecules, and it is stable under direct current. It does not operate and requires alternating voltage.
そこで現在は、商品交流電源を使用した第１図
に示すような湿度検出回路が使用されている。即
ち、第１図に示すものは商品交流電圧を変圧器１
及び抵抗２，３を介してセラミツク感湿素子４に
与えるようにし、セラミツク感湿素子４の湿度の
変化に応じた抵抗値の変化をダイオード５と抵抗
６を介して電圧の変化として取り出し、それを差
動増巾器７により増巾した後、比較器８により設
定電圧と比較し、設定電圧を超えた時スイツチン
グ・トランジスタ９をオンにしてリレー１０を動
作させるようにしたものである。 Therefore, currently, a humidity detection circuit as shown in FIG. 1, which uses a commercial AC power source, is used. That is, in the case shown in Fig. 1, the product AC voltage is transferred to the transformer 1.
and is applied to the ceramic humidity sensing element 4 through the resistors 2 and 3, and the change in resistance value of the ceramic humidity sensing element 4 according to the change in humidity is taken out as a voltage change through the diode 5 and the resistor 6. After being amplified by a differential amplifier 7, the voltage is compared with a set voltage by a comparator 8, and when the set voltage is exceeded, a switching transistor 9 is turned on and a relay 10 is operated.
このように従来の湿度検出装置は交流電源を必
要とするので、用途が限定されていた。 As described above, conventional humidity detection devices require an AC power source, and therefore their applications are limited.
そこで本発明は交流電源を必要としない簡単な
湿度検出回路を提供しようとするものである。 Therefore, the present invention aims to provide a simple humidity detection circuit that does not require an AC power source.
即ち、本発明は、抵抗R1とR2とを直列に接続
した直列回路とセラミツク感湿素子DSと抵抗R3
とを直列に接続した直列回路とを並列に接続して
主ブリツジ回路を構成し、その入力端子ａ、ｂに
直流差動増巾器を用いたパルス発振器を接続する
と共に、前記主ブリツジ回路の相隣る抵抗R2と
R3を共通素子とする基準直流電圧引加用のブリ
ツジ回路を設け、前記ブリツジ回路の出力を前記
パルス発振器のパルス出力が“Ｈ”のときに取り
出すように構成したものである。 That is, the present invention includes a series circuit in which resistors R1 and R2 are connected in series, a ceramic moisture sensing element DS, and a resistor R3.
A main bridge circuit is constructed by connecting in parallel a series circuit in which the and Adjacent resistance R 2 and
A bridge circuit for applying a reference DC voltage having R3 as a common element is provided, and the output of the bridge circuit is taken out when the pulse output of the pulse oscillator is "H".
第２図はその実施例を示すもので、BC１は抵
抗R1，R2，R3及びセラミツク感湿素子DS（以下
センサという）から構成される主ブリツジ回路、
BC２は相隣る前記抵抗R2，R3と、抵抗R′1及び
R4から構成される基準直流電圧印加用ブリツジ
回路である。 FIG. 2 shows an example of this, where BC1 is a main bridge circuit consisting of resistors R 1 , R 2 , R 3 and a ceramic moisture sensing element DS (hereinafter referred to as sensor);
BC2 is connected to the adjacent resistors R 2 and R 3 , and the resistors R′ 1 and
This is a bridge circuit for applying a reference DC voltage consisting of R4 .
OSCは直流差動増巾器OPA１（オペ・アンプ）
と抵抗R5及びコンデンサC1から構成されるパル
ス発振器で、たとえば100Hzのパルス信号を抵抗
Ｒを介して主ブリツジ回路BC１の入力端子ａ、
ｂに与える。 OSC is DC differential amplifier OPA1 (operational amplifier)
A pulse oscillator consisting of a resistor R5 and a capacitor C1 , which sends a pulse signal of, for example, 100Hz to the input terminal a of the main bridge circuit BC1 via the resistor R.
give to b.
OPA２はブリツジ回路の出力端子ｃ、ｄに接
続された直流差動増巾器で、出力信号は逆方向に
接続したダイオードD1とパルス発振器１１のパ
ルス出力が“Ｈ”のとき、パルス発振器OSCの
出力側に接続した抵抗と、前記ダイオードD1の
AND条件で取り出される。 OPA2 is a DC differential amplifier connected to the output terminals c and d of the bridge circuit. and the resistor connected to the output side of the diode D1 .
Extracted using AND condition.
TR１はスイツチング・トランジスタで、ベー
ス電圧が設定電圧になつた時「オン」となり、リ
レーRyを作動させる。 TR1 is a switching transistor that turns "on" when the base voltage reaches the set voltage, activating relay Ry.
以上のように、この発明にかかる湿度検出回路
は、パルス発振器１１のパルス出力をセンサDS
を一辺として組み込んだ主ブリツジ回路BC１に
印加してセンサDSを交流駆動するようにしたの
で、交流電源を必要としないばかりか、電源の影
響を受けない安定した検出が可能である。 As described above, the humidity detection circuit according to the present invention converts the pulse output of the pulse oscillator 11 into the sensor DS.
Since the sensor DS is driven with alternating current by applying it to the main bridge circuit BC1 which incorporates as one side, not only does an alternating current power supply not be required, but stable detection is possible without being affected by the power supply.
主ブリツジ回路BC１はパルス出力が“Ｈ”の
時ブリツジ回路として仂き、“Ｌ”の時は基準直
流電圧印加用ブリツジ回路BC２が仂く。 The main bridge circuit BC1 operates as a bridge circuit when the pulse output is "H", and when the pulse output is "L", the bridge circuit BC2 for applying the reference DC voltage operates.
そしてパルス出力が“Ｈ”のとき、主ブリツジ
回路の出力は抵抗R6とダイオードD1のAND条件
で取り出され抵抗R3，R4とＢ電圧によつて決ま
る設定電圧を湿度検出電圧が超えた時、スイツチ
ング・トランジスタTR１がオンとなつてリレー
Ryを仂かせる。 When the pulse output is "H", the output of the main bridge circuit is taken out under the AND condition of resistor R6 and diode D1 , and the humidity detection voltage exceeds the set voltage determined by resistors R3 , R4 and B voltage. When the switch is turned on, switching transistor TR1 turns on and the relay
Bring on Ry.
インピーダンス検出レベルは抵抗R3とR4を交
換することによつて変えることができる。 The impedance detection level can be changed by swapping resistors R3 and R4 .
なお、実施例回路における抵抗R′1とR4の抵抗
値は、基準直流電圧印加用ブリツジ回路BC２が
仂く場合に、出力端子ｃ、ｄの電圧が中点電圧と
なるように、R′1はR1とR2に等しく（R′1＝R1＝
R2）、またR4はR3と等しい値に選ばれる。 The resistance values of resistors R' 1 and R 4 in the example circuit are set so that the voltages at output terminals c and d become the midpoint voltage when the bridge circuit BC2 for applying the reference DC voltage is used. 1 is equal to R 1 and R 2 (R′ 1 = R 1 =
R 2 ), and R 4 is chosen to be equal to R 3 .
第１図は従来の湿度検出回路図、第２図はこの
発明の実施例の回路図である。
BC１……主ブリツジ回路、BC２……基準直流
電圧印加用ブリツジ回路、OSC……パルス発振
器、DS……セラミツク感湿素子、OPA１及び
OPA２……直流差動増巾器、R1〜R8……抵抗、
C1及びC2……コンデンサ、D1及びD2……ダイオ
ード、Ry……リレー。
FIG. 1 is a conventional humidity detection circuit diagram, and FIG. 2 is a circuit diagram of an embodiment of the present invention. BC1...Main bridge circuit, BC2...Bridge circuit for applying reference DC voltage, OSC...Pulse oscillator, DS...Ceramic moisture sensing element, OPA1 and
OPA2...DC differential amplifier, R1 to R8 ...Resistance,
C 1 and C 2 ... Capacitor, D 1 and D 2 ... Diode, Ry ... Relay.
Claims (1)
抵抗検出型感湿素子DSと抵抗R3とを直列に接続
した直列回路を並列に接続して主ブリツジ回路を
構成し、その入力端子ａ、ｂに直流差動増巾器を
用いたパルス発振器を接続すると共に、前記主ブ
リツジ回路の相隣る抵抗R2とR3を共通素子とす
る基準直流電圧印加用ブリツジ回路を設け、前記
ブリツジ回路の出力を前記パルス発振器のパルス
出力が“Ｈ”のとき取り出すように構成したこと
を特徴とする湿度検出回路。1. A series circuit in which resistors R 1 and R 2 are connected in series,
A pulse oscillator in which a main bridge circuit is constructed by connecting a series circuit in which a resistance detection type humidity sensing element DS and a resistor R3 are connected in series in parallel, and a DC differential amplifier is used at its input terminals a and b. In addition, a bridge circuit for applying a reference DC voltage is provided in which the adjacent resistors R 2 and R 3 of the main bridge circuit are used as common elements, and the output of the bridge circuit is connected so that the pulse output of the pulse oscillator is "H". A humidity detection circuit characterized in that it is configured to be taken out when.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17914482A JPS5968658A (en) | 1982-10-14 | 1982-10-14 | Humidity detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17914482A JPS5968658A (en) | 1982-10-14 | 1982-10-14 | Humidity detecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5968658A JPS5968658A (en) | 1984-04-18 |
| JPH025267B2 true JPH025267B2 (en) | 1990-02-01 |
Family
ID=16060737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17914482A Granted JPS5968658A (en) | 1982-10-14 | 1982-10-14 | Humidity detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5968658A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619232Y2 (en) * | 1986-07-30 | 1994-05-18 | 日本電気株式会社 | CATV relay amplifier monitoring device |
| FI92440C (en) * | 1993-08-23 | 1994-11-10 | Vaisala Oy | Detector and method for observing the presence of a liquid and / or a change thereof |
-
1982
- 1982-10-14 JP JP17914482A patent/JPS5968658A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5968658A (en) | 1984-04-18 |
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