JPS63187131A - Zero point compensation circuit of pressure transducer - Google Patents
Zero point compensation circuit of pressure transducerInfo
- Publication number
- JPS63187131A JPS63187131A JP1867787A JP1867787A JPS63187131A JP S63187131 A JPS63187131 A JP S63187131A JP 1867787 A JP1867787 A JP 1867787A JP 1867787 A JP1867787 A JP 1867787A JP S63187131 A JPS63187131 A JP S63187131A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- zero point
- pressure sensor
- temp
- 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
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
- G01L1/2281—Arrangements for correcting or for compensating unwanted effects for temperature variations
Abstract
Description
【発明の詳細な説明】
〔対象技術分野〕
この発明は圧力トランデューサの零点電圧が温度によっ
て変化するのを電気的に補償する回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to a circuit for electrically compensating for changes in the zero point voltage of a pressure transducer due to temperature.
一般に半導体圧カド２ンデユーサは圧力センサに給電す
る電源回路と、圧力センサの出力を増幅する増幅回路を
圧力センサ本体の周囲に有している。すなわち第２図に
おいて圧力センサ１は半導体拡散抵抗ＲＢＩ、ＲＢ２．
ＲＢ３およびＲＢ４により形成されるプリッジ回路によ
り構成され、その入力端は演算増幅器２を介して電源２
０の端子ａ、ｂに接続される。′電源回路は電源２０と
演算増幅器２および抵抗３ 、４ 、５により構成され
、圧力センサＩＫ定電流を供給する。また増幅回路１５
は抵抗６，７，８，９および演算増幅器ｌＯＫより構成
され、この増幅回路は圧力センサ１のプリッジ出力を増
幅し、その出力は出力端子Ｃから得られる。Generally, a semiconductor pressure sensor has a power supply circuit for supplying power to the pressure sensor and an amplifier circuit for amplifying the output of the pressure sensor around the pressure sensor body. That is, in FIG. 2, the pressure sensor 1 includes semiconductor diffusion resistors RBI, RB2 .
It is composed of a bridge circuit formed by RB3 and RB4, and its input terminal is connected to the power supply 2 via the operational amplifier 2.
Connected to terminals a and b of 0. 'The power supply circuit is composed of a power supply 20, an operational amplifier 2, and resistors 3, 4, and 5, and supplies a constant current to the pressure sensor IK. Also, the amplifier circuit 15
is composed of resistors 6, 7, 8, and 9 and an operational amplifier lOK, and this amplifier circuit amplifies the bridge output of the pressure sensor 1, and the output is obtained from the output terminal C.
ところが圧力センサ１のプリッジ回路が有する零点電圧
の影響により、そのままの状態では出力端子Ｃに現われ
る零点電圧Ｖｏとして希望する値が得られない。However, due to the influence of the zero-point voltage of the bridge circuit of the pressure sensor 1, the desired value of the zero-point voltage Vo appearing at the output terminal C cannot be obtained in this state.
この欠点を改善するため第３図に示すように定電圧を抵
抗１１．１２により分圧した値を抵抗９を介して増幅回
路１５に入力している。しかし圧力センサｌはその構成
要素が半導体であるため、そのプリッジ抵抗は回路の外
付は抵抗に比べてひじように大きな温度係数を有してい
る。したがって周囲温度の変化が大きくなると、すでＫ
ｙ４整した増幅回路出力における零点′電圧からのずれ
が太さくなる。この出力電圧のずれはその温度変化によ
る情報が増幅回路に与えられていないことに起因する。In order to improve this drawback, as shown in FIG. 3, a value obtained by dividing a constant voltage by resistors 11 and 12 is inputted to the amplifier circuit 15 via a resistor 9. However, since the components of the pressure sensor 1 are semiconductors, the bridge resistor has a temperature coefficient that is much larger than that of the resistor external to the circuit. Therefore, when the change in ambient temperature becomes large, K
The deviation from the zero point voltage in the y4-adjusted amplifier circuit output becomes thicker. This deviation in output voltage is caused by the fact that information due to the temperature change is not provided to the amplifier circuit.
この発明はこのような従来の欠点にかんがみ、周囲温度
変化による増幅回路の出力電圧の調整点からのずれを簡
単な方法により減少させることを目的とする。SUMMARY OF THE INVENTION In view of these conventional drawbacks, it is an object of the present invention to reduce the deviation of the output voltage of an amplifier circuit from the adjustment point due to changes in ambient temperature by a simple method.
この発明は半導体抵抗によりプリッジ回路を構成し、こ
のプリッジ回路を圧力センサとして適用し、かつこの圧
力センサ自体を温度センサとして利用し、さらにこの圧
力センサへの供給電源電圧を外付は抵抗によって分圧し
た電位を直接増幅回路に与えることにより、あらかじめ
調整された増幅回路出力の零点電圧からのずれを減少さ
せるようＫしたものである。This invention configures a bridge circuit using semiconductor resistors, applies this bridge circuit as a pressure sensor, uses this pressure sensor itself as a temperature sensor, and further divides the power supply voltage to this pressure sensor using an external resistor. By directly applying the voltage applied to the amplifier circuit to the amplifier circuit, the deviation from the zero point voltage of the output of the amplifier circuit, which has been adjusted in advance, is reduced.
以下図によってこの発明の一実施例について説明する。 An embodiment of the present invention will be described below with reference to the drawings.
なお第２図および第３図と共通の部分についてはその説
明を省略する。Note that explanations of parts common to FIGS. 2 and 3 will be omitted.
すなわち第１図において演算増幅器２の出力端と電源端
子す間に分圧抵抗１１および１２が接続され、これらの
抵抗の接続点が抵抗９を介して演算増幅器１０の一方の
入力端に接続されている。That is, in FIG. 1, voltage dividing resistors 11 and 12 are connected between the output terminal of operational amplifier 2 and the power supply terminal, and the connection point of these resistors is connected to one input terminal of operational amplifier 10 via resistor 9. ing.
ここで第１図に示すこの発明の実施例と第３図に示す従
来例とを比較すると次のようになる。A comparison between the embodiment of the present invention shown in FIG. 1 and the conventional example shown in FIG. 3 will be as follows.
両図においてＶａは増幅回路１５の出力電圧の中、零点
電圧Ｖｏを調整するために分圧抵抗１１．１２によって
与えられる電圧で、第１図および第３図ともある温度Ｔ
１での零点電圧■０はＶｏ ＝ Ｖａ −Ｇａ ＠ Ｖ
ｏｆｆとなる。ここでＧａは演算増幅器１０のゲイン、
またＶｏｆｆは温度Ｔ、において演算増幅器１０を接続
しない状態の圧力センサｌの出力端子に現われる電圧す
なわち圧力センサ１のオフセット電圧である。In both figures, Va is the voltage given by the voltage dividing resistor 11.12 in order to adjust the zero point voltage Vo among the output voltages of the amplifier circuit 15, and Va is the voltage given by the voltage dividing resistor 11.12 in order to adjust the zero point voltage Vo.
The zero point voltage at 1 ■0 is Vo = Va - Ga @ V
It becomes off. Here, Ga is the gain of the operational amplifier 10,
Further, Voff is the voltage appearing at the output terminal of the pressure sensor 1 when the operational amplifier 10 is not connected at the temperature T, that is, the offset voltage of the pressure sensor 1.
そして温度ＴＩから周囲温度がｔ℃だけ変化したときの
演算増幅器１０の出力の零点電圧Ｖｏ（ｔ）はＶ ｏｆ
ｔ） ＝ Ｖ ａ（ｔ） −Ｇ ａ ・Ｖ ｏｆｆ（ｔ
）である。Then, the zero point voltage Vo(t) of the output of the operational amplifier 10 when the ambient temperature changes by t°C from the temperature TI is V of
t) = V a(t) −G a ・V off(t
).
次に圧力センサ１を構成する半導体抵抗の１次の温度係
数をαとすると、第３図の回路においてはＶａ（ｊｌ＝
Ｖａ 、 Ｖｏｆｆ（ｔｌ ＝ Ｖｏｆｆ ・（１＋
αｔ）、また第１図の回路ではＶｏ（ｔ）＝Ｖａ（１＋
αｔ） ｔ Ｖ ｏｆｆ （’）＝Ｖｏｆｆ（１＋αＣ
）である。Next, if the first-order temperature coefficient of the semiconductor resistor that constitutes the pressure sensor 1 is α, then in the circuit of FIG. 3, Va (jl=
Va, Voff (tl = Voff ・(1+
αt), and in the circuit of FIG. 1, Vo(t)=Va(1+
αt) t V off (')=Voff(1+αC
).
また周囲温度の変化によ、る零点電圧Ｖｏからのずれの
絶対値すなわちＩ Ｖｏ（ｔ） −Ｖｏ Ｉは第３図の
回路ではＩＧａ−ｖｏｆｆ・αｔ１ となり、また第１
図の回路ではＶｏ・αｔとなる。In addition, the absolute value of the deviation from the zero point voltage Vo due to changes in ambient temperature, ie, IVo(t) -VoI, becomes IGa-voff・αt1 in the circuit shown in FIG.
In the circuit shown in the figure, it becomes Vo·αt.
したがって第３図に示す回路においては圧力センサ１の
出力を増幅する演算増幅器ｌＯのゲインＧａが大きく、
かつ演算増幅器１０の出力の初期零点電圧■０が小さい
ほど温度変化による零点電圧のずれへの効果は太きい。Therefore, in the circuit shown in FIG. 3, the gain Ga of the operational amplifier lO for amplifying the output of the pressure sensor 1 is large;
In addition, the smaller the initial zero point voltage (20) of the output of the operational amplifier 10, the greater the effect on the shift of the zero point voltage due to temperature change.
たとえば演算増幅器１０のゲインＧａを２０、圧力セン
サｌすなわちプリッジ（ロ）路のオフセラ）ＭＥ圧Ｖｏ
ｆｆを１０ｍＶ、初期零点電圧ｖＯを２００ ｍ Ｖと
したときの温度変化によるずれは第１図および第３図と
も等しいが、ゲインＧａを４０としたとぎには第１図の
回路におけるずれは第３図の回路によるずれの２分の１
となる。For example, if the gain Ga of the operational amplifier 10 is 20, then the pressure sensor l (that is, the pressure sensor l of the bridge (b) path) ME pressure Vo
The deviation due to temperature change when ff is 10 mV and the initial zero point voltage vO is 200 mV is the same in both Figures 1 and 3, but when the gain Ga is set to 40, the deviation in the circuit in Figure 1 is as follows. 1/2 of the deviation due to the circuit in Figure 3
becomes.
この発明は上述のように圧力センサを定電流で駆動する
電源電圧を分圧し、この分′亀圧を増幅回路に直接与え
ることにより、圧力センサＫ［囲温度の変化によって２
次的に発生する零点電圧を減少させるようＫしているの
で、とくに増幅回路の増幅率の高いばあいにはその出力
電圧の調整点からのずれをより少なくすることができる
効果がある。As described above, this invention divides the power supply voltage that drives the pressure sensor with a constant current, and directly applies this divided voltage to the amplifier circuit.
Since K is set so as to reduce the zero point voltage that occurs next, there is an effect that the deviation of the output voltage from the adjustment point can be further reduced, especially when the amplification factor of the amplifier circuit is high.
第１図はこの発明の一実施例を示す回路図、第２図およ
び第３図は従来の回路図である。
１・・・圧力センサ、２・・・演算増幅器、３・・・抵
抗、４・・・抵抗、５・・・抵抗、６・・・抵抗、７・
・・抵抗、８・・・抵抗、９・・・抵抗、１０・・・演
算増幅器、１１・・・抵抗、１２・・・抵抗、１５・・
・増幅回路、２０・・・電源。
特 許 出 願 人 山武ハネウェル株式会社（外
２名） ”′
第１図FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are conventional circuit diagrams. DESCRIPTION OF SYMBOLS 1... Pressure sensor, 2... Operational amplifier, 3... Resistor, 4... Resistor, 5... Resistor, 6... Resistor, 7...
... Resistor, 8... Resistor, 9... Resistor, 10... Operational amplifier, 11... Resistor, 12... Resistor, 15...
- Amplifier circuit, 20... power supply. Patent applicant Yamatake Honeywell Co., Ltd. (2 others) ”’ Figure 1
Claims (1)
力センサと、この圧力センサを定電流駆動する定電流回
路と、上記圧力センサの出力を増幅する増幅回路を備え
た圧力トランデューサにおいて、上記圧力センサを定電
流で駆動する電源電圧を分圧し、この分電圧を上記増幅
回路に直接与えることにより、上記圧力センサに、周囲
温度の変化によって２次的に発生する零点電圧を減少さ
せることを特徴とする圧力トランデューサの零点補償回
路。The pressure transducer is equipped with a semiconductor pressure sensor configured with a bridge circuit of semiconductor diffused resistors, a constant current circuit that drives the pressure sensor with a constant current, and an amplifier circuit that amplifies the output of the pressure sensor. A pressure sensor characterized by dividing a power supply voltage driven by a current and directly applying the divided voltage to the amplifier circuit to reduce the zero point voltage that occurs secondarily in the pressure sensor due to a change in ambient temperature. Transducer zero point compensation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1867787A JPS63187131A (en) | 1987-01-30 | 1987-01-30 | Zero point compensation circuit of pressure transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1867787A JPS63187131A (en) | 1987-01-30 | 1987-01-30 | Zero point compensation circuit of pressure transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63187131A true JPS63187131A (en) | 1988-08-02 |
Family
ID=11978238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1867787A Pending JPS63187131A (en) | 1987-01-30 | 1987-01-30 | Zero point compensation circuit of pressure transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63187131A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04265831A (en) * | 1990-10-25 | 1992-09-22 | Becton Dickinson & Co | Apparatus and method for compensating for temperature of pressure transducer at catheter tip |
| EP0565124A1 (en) * | 1992-04-09 | 1993-10-13 | Erich Jaeger GmbH | Procedure and circuit for the electrical compensation of temperature-effects on the measured signal of a mechanical-electrical measuring transducer |
-
1987
- 1987-01-30 JP JP1867787A patent/JPS63187131A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04265831A (en) * | 1990-10-25 | 1992-09-22 | Becton Dickinson & Co | Apparatus and method for compensating for temperature of pressure transducer at catheter tip |
| US5866821A (en) * | 1990-10-25 | 1999-02-02 | Becton Dickinson And Company | Apparatus for a temperature compensation of a catheter tip pressure transducer |
| EP0565124A1 (en) * | 1992-04-09 | 1993-10-13 | Erich Jaeger GmbH | Procedure and circuit for the electrical compensation of temperature-effects on the measured signal of a mechanical-electrical measuring transducer |
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