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JPS62165518U - - Google Patents

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Publication number
JPS62165518U
JPS62165518U JP5280386U JP5280386U JPS62165518U JP S62165518 U JPS62165518 U JP S62165518U JP 5280386 U JP5280386 U JP 5280386U JP 5280386 U JP5280386 U JP 5280386U JP S62165518 U JPS62165518 U JP S62165518U
Authority
JP
Japan
Prior art keywords
temperature
supplied
converter
flow rate
differential amplifiers
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
Application number
JP5280386U
Other languages
Japanese (ja)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP5280386U priority Critical patent/JPS62165518U/ja
Publication of JPS62165518U publication Critical patent/JPS62165518U/ja
Pending legal-status Critical Current

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Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の一実施例を示す回路図、第２
図は同じく動作特性を示す線図、第３図は従来例
を示す回路図である。 １…Ａ／Ｄ変換器、２…マイクロコンピユータ
（演算回路）、ＯＰ…差動増幅器（制御回路用）
、ＯＰ１，ＯＰ２…差動増幅器、ＲＨ…感温抵抗
、ＲＫ…抵抗（温度補償用）、Ｒ１，Ｒ２，Ｒ３
…抵抗（ブリツジ回路用）、Ｒ４…抵抗（制御回
路用）、Ｒ５１，Ｒ５２，Ｒ６１，Ｒ６２，Ｒ７
１，Ｒ７２…抵抗、Ｒ８１，Ｒ８２…抵抗（帰還
用）、Ｕｍ…端子電圧、Ｖｒ１，Ｖｒ２…基準電
圧、ＶＳ１，ＶＳ２…出力電圧、Ｄ１，Ｄ２…Ａ
／Ｄ変換器の出力、Ｔｒ…トランジスタ（制御回
路用）。 Figure 1 is a circuit diagram showing one embodiment of the present invention;
The same figure is a diagram showing the operating characteristics, and FIG. 3 is a circuit diagram showing a conventional example. 1...A/D converter, 2...Microcomputer (arithmetic circuit), OP...Differential amplifier (for control circuit)
, OP 1 , OP 2 ... Differential amplifier, RH ... Temperature-sensitive resistor, RK ... Resistor (for temperature compensation), R 1 , R 2 , R 3
 ... Resistor (for bridge circuit), R 4 ... Resistor (for control circuit), R 51 , R 52 , R 61 , R 62 , R 7
1 , R72 ...Resistor, R81 , R82 ...Resistor (for feedback), Um ...Terminal voltage, Vr1 , Vr2 ...Reference voltage, VS1 , VS2 ...Output voltage, D1 , D2 ...A
/D converter output, T r ...transistor (for control circuit).

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 流体通路中に配設した感温抵抗と複数の抵抗と
で構成したブリツジ回路と、流体流量に応じた前
記感温抵抗の抵抗値の変化を感知して該抵抗値を
一定に保つよう前記ブリツジ回路への供給電流を
制御する制御回路と、前記供給電流に対応する電
圧値をデジタル値に変換するＡ／Ｄ変換器と、該
Ａ／Ｄ変換器の出力値に基いて流体流量を演算す
る演算回路とを備えて構成された感温式流量測定
装置において、出力電圧が前記Ａ／Ｄ変換器に供
給される複数個の差動増幅器を設け、これら各差
動増幅器に印加される基準電圧及び抵抗係数を異
ならせると共に、前記ブリツジ回路の感温抵抗と
直列に接続された抵抗の端子電圧を前記各差動増
幅器に比較電圧として供給するようにしたことを
特徴とする感温式流量測定装置。 A bridge circuit includes a temperature-sensitive resistor and a plurality of resistors disposed in a fluid passage, and a bridge circuit configured to sense a change in the resistance value of the temperature-sensitive resistor according to the fluid flow rate and keep the resistance value constant. A control circuit that controls current supplied to the circuit, an A/D converter that converts a voltage value corresponding to the supplied current into a digital value, and a fluid flow rate calculated based on the output value of the A/D converter. A temperature-sensitive flow rate measuring device configured with an arithmetic circuit includes a plurality of differential amplifiers whose output voltages are supplied to the A/D converter, and a reference voltage applied to each of these differential amplifiers. and resistance coefficients are different, and a terminal voltage of a resistor connected in series with the temperature-sensitive resistor of the bridge circuit is supplied as a comparison voltage to each of the differential amplifiers. Device.
JP5280386U 1986-04-10 1986-04-10 Pending JPS62165518U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5280386U JPS62165518U (en) 1986-04-10 1986-04-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5280386U JPS62165518U (en) 1986-04-10 1986-04-10

Publications (1)

Publication Number Publication Date
JPS62165518U true JPS62165518U (en) 1987-10-21

Family

ID=30878298

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5280386U Pending JPS62165518U (en) 1986-04-10 1986-04-10

Country Status (1)

Country Link
JP (1) JPS62165518U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335126A (en) * 1989-07-03 1991-02-15 Hitachi Ltd Hot-wire type air flowmeter
JP2002005716A (en) * 2000-06-23 2002-01-09 Yazaki Corp Flowmeter using flow sensor
JP2002022513A (en) * 2000-07-04 2002-01-23 Yazaki Corp Flow measuring device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4895869A (en) * 1972-03-18 1973-12-08
JPS5776918A (en) * 1980-10-30 1982-05-14 Fujisoku:Kk A/d converter
JPS5935109A (en) * 1982-08-23 1984-02-25 Hitachi Ltd Thermal flowmeter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4895869A (en) * 1972-03-18 1973-12-08
JPS5776918A (en) * 1980-10-30 1982-05-14 Fujisoku:Kk A/d converter
JPS5935109A (en) * 1982-08-23 1984-02-25 Hitachi Ltd Thermal flowmeter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335126A (en) * 1989-07-03 1991-02-15 Hitachi Ltd Hot-wire type air flowmeter
JP2002005716A (en) * 2000-06-23 2002-01-09 Yazaki Corp Flowmeter using flow sensor
JP2002022513A (en) * 2000-07-04 2002-01-23 Yazaki Corp Flow measuring device

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