JPH01156424U - - Google Patents
Info
- Publication number
- JPH01156424U JPH01156424U JP5342088U JP5342088U JPH01156424U JP H01156424 U JPH01156424 U JP H01156424U JP 5342088 U JP5342088 U JP 5342088U JP 5342088 U JP5342088 U JP 5342088U JP H01156424 U JPH01156424 U JP H01156424U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- output voltage
- heat
- control 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
Description
第１図はこの考案の一実施例による感熱式流量
センサを示す回路図、第２図は第１図の動作の説
明に供する図、第３図、第４図は従来の制御回路
を示す図、第５図は第３図の動作の説明に供する
図、第６図は白金線を加熱抵抗体とする感熱式空
気流量センサの構造を示す縦断側面図および正面
図、第７図は加熱抵抗体の温度制御回路を示す図
、第８図は第７図の温度制御回路における調整方
法の説明に供する図である。
１０……温度制御回路、１１……減算回路、１
２……分圧回路、１３……演算回路、１４……増
幅回路、ＲＨ……感熱抵抗体、ＲＣ……空気温セ
ンサ、Ｒ１，Ｒ２……抵抗。なお、図中、同一符
号は同一、または相当部分を示す。
Fig. 1 is a circuit diagram showing a thermal flow rate sensor according to an embodiment of this invention, Fig. 2 is a diagram used to explain the operation of Fig. 1, and Figs. 3 and 4 are diagrams showing conventional control circuits. , Fig. 5 is a diagram used to explain the operation of Fig. 3, Fig. 6 is a longitudinal side view and a front view showing the structure of a thermal air flow sensor using a platinum wire as a heating resistor, and Fig. 7 is a diagram showing the heating resistor. FIG. 8 is a diagram showing a body temperature control circuit, and is a diagram for explaining an adjustment method in the temperature control circuit of FIG. 7. 10...Temperature control circuit, 11...Subtraction circuit, 1
2...Voltage dividing circuit, 13... Arithmetic circuit, 14... Amplifying circuit, RH... Heat sensitive resistor, RC... Air temperature sensor, R1 , R2 ... Resistance. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
補正 平１．６．２８
実用新案登録請求の範囲を次のように補正する
。Amendment June 28, 1999 The scope of claims for utility model registration is amended as follows.
【実用新案登録請求の範囲】
流体通路中に配設された感熱抵抗体と複数の抵
抗とより構成されたブリツジ回路を含み前記感熱
抵抗体への通電々流を制御し上記ブリツジ回路が
所定の熱平衡を保つように制御する温度制御回路
により構成され、熱平衡の状態から流量を検出す
る感熱式流量センサにおいて、前記ブリツジ回路
の感熱抵抗体と直列に接続された抵抗の端子電圧
から得られる前記温度制御回路の出力電圧から所
定の電圧を減算する減算回路と、この減算回路の
出力電圧を分圧する分圧回路と、この分圧回路の
出力電圧を増幅する増幅回路と、前記温度制御回
路の出力電圧が正極性の入力端子に入力され、か
つ前記減算回路の出力電圧と前記増幅回路の出力
電圧が相反する極性となる様入力された演算回路
を備えたことを特徴とする感熱式流量センサ。[Claims for Utility Model Registration] The bridge circuit includes a bridge circuit composed of a heat-sensitive resistor and a plurality of resistors disposed in a fluid passage, and the bridge circuit controls current flow to the heat-sensitive resistor. In a heat-sensitive flow rate sensor that is configured with a temperature control circuit that controls to maintain thermal equilibrium and detects the flow rate from a state of thermal equilibrium, the temperature obtained from the terminal voltage of a resistor connected in series with the heat-sensitive resistor of the bridge circuit. A subtraction circuit that subtracts a predetermined voltage from the output voltage of the control circuit, a voltage divider circuit that divides the output voltage of this subtraction circuit, an amplifier circuit that amplifies the output voltage of this voltage divider circuit, and an output of the temperature control circuit. A heat-sensitive flow rate sensor, comprising: an arithmetic circuit to which a voltage is input to a positive input terminal, and to which the output voltage of the subtraction circuit and the output voltage of the amplification circuit have opposite polarities .
Claims (1)
抗とより構成されたブリツジ回路を含み前記感熱
抵抗体への通電々流を制御し上記ブリツジ回路が
所定の熱平衡を保つように制御する温度制御回路
により構成され、熱平衡の状態から流量を検出す
る感熱式流量センサにおいて、前記ブリツジ回路
の感熱抵抗体と直列に接続された抵抗の端子電圧
から得られる前記温度制御回路の出力電圧から所
定の電圧を減算する減算回路と、この減算回路の
出力電圧を分圧する分圧回路と、この分圧回路の
出力電圧を増幅する増幅回路と、この増幅回路の
出力電圧と前記温度制御回路の出力電圧とを加算
するとともにこの加算された電圧から前記減算回
路の出力電圧を減算する演算回路とを備えたこと
を特徴とする感熱式流量センサ。 A temperature including a bridge circuit including a heat-sensitive resistor and a plurality of resistors disposed in a fluid passage, and controlling current flow to the heat-sensitive resistor so that the bridge circuit maintains a predetermined thermal balance. In a heat-sensitive flow sensor that is configured with a control circuit and detects the flow rate from a state of thermal equilibrium, a predetermined value is obtained from the output voltage of the temperature control circuit obtained from the terminal voltage of a resistor connected in series with the heat-sensitive resistor of the bridge circuit. A subtraction circuit that subtracts a voltage, a voltage divider circuit that divides the output voltage of this subtraction circuit, an amplifier circuit that amplifies the output voltage of this voltage divider circuit, an output voltage of this amplifier circuit, and an output voltage of the temperature control circuit. and an arithmetic circuit that adds the voltage and subtracts the output voltage of the subtraction circuit from the added voltage.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5342088U JPH0633375Y2 (en) | 1988-04-19 | 1988-04-19 | Thermal flow sensor |
| US07/312,110 US4907446A (en) | 1988-02-24 | 1989-02-21 | Flow sensor incorporating a thermoresistor |
| KR2019890001881U KR920005284Y1 (en) | 1988-02-24 | 1989-02-23 | Thermal type water volume sensor |
| DE3906344A DE3906344A1 (en) | 1988-02-24 | 1989-02-24 | THERMAL FLOW SENSOR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5342088U JPH0633375Y2 (en) | 1988-04-19 | 1988-04-19 | Thermal flow sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01156424U true JPH01156424U (en) | 1989-10-27 |
| JPH0633375Y2 JPH0633375Y2 (en) | 1994-08-31 |
Family
ID=31279400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5342088U Expired - Lifetime JPH0633375Y2 (en) | 1988-02-24 | 1988-04-19 | Thermal flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0633375Y2 (en) |
-
1988
- 1988-04-19 JP JP5342088U patent/JPH0633375Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0633375Y2 (en) | 1994-08-31 |
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