JPH041439U - - Google Patents
Info
- Publication number
- JPH041439U JPH041439U JP4119690U JP4119690U JPH041439U JP H041439 U JPH041439 U JP H041439U JP 4119690 U JP4119690 U JP 4119690U JP 4119690 U JP4119690 U JP 4119690U JP H041439 U JPH041439 U JP H041439U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- humidity
- humidity sensor
- voltage
- differentiating 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.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- 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
第１図は本考案の第１実施例の回路図、第２図
は第２実施例の回路図、第３図は従来の湿度セン
サの説明図、第４図は従来の湿度センサの回路例
、第５図は従来の湿度センサの特性例、を示した
図である。
ＶＣ……可変コンデンサ、Ｒ……固定抵抗、Ｒ
１０……抵抗、Ｃ８……コンデンサ、７……電荷
注入型可変コンデンサ。
Fig. 1 is a circuit diagram of the first embodiment of the present invention, Fig. 2 is a circuit diagram of the second embodiment, Fig. 3 is an explanatory diagram of a conventional humidity sensor, and Fig. 4 is an example of a circuit of a conventional humidity sensor. , FIG. 5 is a diagram showing an example of the characteristics of a conventional humidity sensor. VC...variable capacitor, R...fixed resistance, R
10 ...Resistor, C8 ...Capacitor, 7...Charge injection type variable capacitor.
Claims (1)
スが変化する湿度センサ素子ＨＳを用い、湿度の
変化を周波数の変化に変換する湿度−周波数変換
回路１と、 前記湿度−周波数変換回路１の出力信号を微分
して、前記信号よりも幅の狭いパルス列を出力す
る微分回路２と、 前記微分回路２の出力信号から不要成分を取り
除いたパルス列を積分する積分回路４と、 前記微分回路の一部に設け、積分回路の出力電
圧で制御を行う、トランジスタ等の電圧制御可変
インピーダンス素子５とから成る湿度センサにお
いて、 前記電圧制御可変インピーダンス素子を構成す
るトランジスタＴｒのベース抵抗を固定抵抗Ｒと
し、 前記微分回路２のコンデンサを可変コンデンサ
ＶＣで構成し、 前記可変コンデンサＶＣにより、湿度センサ素
子ＨＳのバラツキを補正することを特徴とする湿
度センサ。 (2) 相対湿度に対して非直線的にインピーダン
スが変化する湿度センサ素子ＨＳを用い、湿度の
変化を周波数の変化に変換する湿度−周波数変換
回路１と、 前記湿度−周波数変換回路１の出力信号を微分
して、前記信号よりも幅の狭いパルス列を出力す
る微分回路２と、 前記微分回路２の出力信号から不要成分を取り
除いたパルス列を積分する積分回路４と、 前記微分回路の一部に設け、積分回路の出力電
圧で制御を行う、トランジスタ等の電圧制御可変
インピーダンス素子５と、 前記積分回路の出力側に接続した温度補償回路
６とから成る湿度センサにおいて、 前記電圧制御可変インピーダンス素子を構成す
るトランジスタＴｒのベース抵抗を固定抵抗Ｒと
し、 前記微分回路２のコンデンサを可変コンデンサ
ＶＣで構成し、 前記可変コンデンサＶＣにより、湿度センサ素
子ＨＳのバラツキを補正することを特徴とする湿
度センサ。 (3) 前記請求項(1)又は(2)記載の湿度センサに
おいて、 前記可変コンデンサＶＣとして、電荷注入型可
変コンデンサ７を用いたことを特徴とする湿度セ
ンサ。[Claims for Utility Model Registration] (1) A humidity-frequency conversion circuit 1 that converts changes in humidity into changes in frequency using a humidity sensor element HS whose impedance changes non-linearly with respect to relative humidity; A differentiating circuit 2 that differentiates the output signal of the humidity-frequency conversion circuit 1 and outputs a pulse train having a narrower width than the signal; and an integrating circuit 4 that integrates the pulse train from which unnecessary components have been removed from the output signal of the differentiating circuit 2. and a voltage-controlled variable impedance element 5 such as a transistor, which is provided as a part of the differentiating circuit and controlled by the output voltage of the integrating circuit, wherein the base of the transistor Tr constituting the voltage-controlled variable impedance element is A humidity sensor characterized in that the resistor is a fixed resistor R, the capacitor of the differentiating circuit 2 is a variable capacitor VC, and the variable capacitor VC corrects variations in the humidity sensor element HS. (2) a humidity-frequency conversion circuit 1 that converts changes in humidity into changes in frequency using a humidity sensor element HS whose impedance changes non-linearly with respect to relative humidity; and an output of the humidity-frequency conversion circuit 1. a differentiating circuit 2 that differentiates a signal and outputs a pulse train having a narrower width than the signal; an integrating circuit 4 that integrates a pulse train obtained by removing unnecessary components from the output signal of the differentiating circuit 2; and a part of the differentiating circuit. A humidity sensor comprising a voltage-controlled variable impedance element 5, such as a transistor, which is provided in a circuit and controlled by an output voltage of an integrating circuit, and a temperature compensation circuit 6 connected to the output side of the integrating circuit, wherein the voltage-controlled variable impedance element The base resistance of the transistor Tr constituting is a fixed resistance R, the capacitor of the differentiating circuit 2 is a variable capacitor VC, and the variable capacitor VC corrects variations in the humidity sensor element HS. sensor. (3) The humidity sensor according to claim (1) or (2), wherein a charge injection variable capacitor 7 is used as the variable capacitor VC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4119690U JPH041439U (en) | 1990-04-18 | 1990-04-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4119690U JPH041439U (en) | 1990-04-18 | 1990-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH041439U true JPH041439U (en) | 1992-01-08 |
Family
ID=31551659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4119690U Pending JPH041439U (en) | 1990-04-18 | 1990-04-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH041439U (en) |
-
1990
- 1990-04-18 JP JP4119690U patent/JPH041439U/ja active Pending
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