JP2501224B2 - Output voltage adjustment method in pressure sensor circuit - Google Patents
Output voltage adjustment method in pressure sensor circuitInfo
- Publication number
- JP2501224B2 JP2501224B2 JP63050449A JP5044988A JP2501224B2 JP 2501224 B2 JP2501224 B2 JP 2501224B2 JP 63050449 A JP63050449 A JP 63050449A JP 5044988 A JP5044988 A JP 5044988A JP 2501224 B2 JP2501224 B2 JP 2501224B2
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- JP
- Japan
- Prior art keywords
- voltage
- pressure
- output
- section
- amplification
- 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.)
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Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、スパン調整およびゼロ調整に関する圧力セ
ンサ回路における出力電圧調整方法に関する。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to an output voltage adjusting method in a pressure sensor circuit for span adjustment and zero adjustment.
（従来の技術） 従来、電気掃除機のフィルタの目詰りなどを検知する
圧力センサ回路としては、たとえば第２図記載の構成が
知られている。(Prior Art) Conventionally, for example, a configuration shown in FIG. 2 is known as a pressure sensor circuit that detects clogging of a filter of an electric vacuum cleaner.
第２図において、１はたとえば5Vのオフセット電圧を
設定する電源で、この電源１はオペアンプ２の非反転入
力端子に接続され、このオペアンプ２はオペアンプ用の
電源３に接続されるとともに接地されている。また、オ
ペアンプ２の出力端子および反転入力端子は圧力検出変
換部としての圧力センサ４に接続されている。In FIG. 2, reference numeral 1 is a power supply for setting an offset voltage of, for example, 5 V. This power supply 1 is connected to a non-inverting input terminal of an operational amplifier 2, and this operational amplifier 2 is connected to a power supply 3 for the operational amplifier and grounded. There is. Further, the output terminal and the inverting input terminal of the operational amplifier 2 are connected to the pressure sensor 4 as a pressure detection conversion unit.
この圧力センサ４は、たとえば圧力による歪などの変
形を検出し、この変形を抵抗値変化に変換する半導体5,
6,7,8がブリッジ接続されたもので、半導体5,6間にオペ
アンプ２の出力端子が接続され、半導体7,8間にオペア
ンプ２の反転入力端子が接続されているとともに抵抗９
を介して接地されている。また、半導体5,7間にはブリ
ッジの平衡調整を行なう出力調整用可変抵抗10が接続さ
れ、この出力調整用可変抵抗10の摺動子は抵抗11を介し
て、半導体6,8間は抵抗12を介して初段増幅部13の初段
オペアンプ14の非半転入力端子および反転入力端子に接
続されている。さらに、初段オペアンプ14は出力端子と
反転入力端子間に帰還抵抗15が接続されている。The pressure sensor 4 detects a deformation such as a strain due to pressure and converts the deformation into a resistance value change.
6, 7 and 8 are bridge-connected, the output terminal of the operational amplifier 2 is connected between the semiconductors 5 and 6, and the inverting input terminal of the operational amplifier 2 is connected between the semiconductors 7 and 8 and the resistance 9
Grounded through. Further, an output adjusting variable resistor 10 for adjusting the balance of the bridge is connected between the semiconductors 5 and 7, and a slider of the output adjusting variable resistor 10 is connected via the resistor 11 and a resistor is provided between the semiconductors 6 and 8. It is connected via 12 to the non-half-inverting input terminal and the inverting input terminal of the first-stage operational amplifier 14 of the first-stage amplifying section 13. Further, the first stage operational amplifier 14 has a feedback resistor 15 connected between the output terminal and the inverting input terminal.
そして、電源１には非反転入力端子が接続されボルテ
ージホロワを構成する定電圧部としてのオペアンプ16が
接続され、このオペアンプ16の出力端が抵抗17を介して
初段オペアンプ14の非反転入力端子に接続されている。
また、初段オペアンプ14の出力端は2kΩの抵抗21を介し
て、オペアンプ16の出力端子は抵抗22を介して終段増幅
部23を構成する終段オペアンプ24の反転入力端子および
非反転入力端子にそれぞれ接続されている。また、この
終段オペアンプ24の出力端子と反転入力端子の間には増
幅用帰還抵抗25が接続され、この増幅用帰還抵抗25は抵
抗26と増幅用可変抵抗27とから構成されている。Then, a non-inverting input terminal is connected to the power supply 1 and an operational amplifier 16 as a constant voltage unit that constitutes a voltage follower is connected. An output terminal of the operational amplifier 16 is connected via a resistor 17 to a non-inverting input terminal of the first-stage operational amplifier 14. It is connected to the.
The output terminal of the first-stage operational amplifier 14 is connected via a resistor 21 of 2 kΩ, and the output terminal of the operational amplifier 16 is connected via a resistor 22 to the inverting input terminal and the non-inverting input terminal of a final-stage operational amplifier 24 which constitutes a final-stage amplifier 23. Each is connected. An amplification feedback resistor 25 is connected between the output terminal and the inverting input terminal of the final stage operational amplifier 24, and the amplification feedback resistor 25 is composed of a resistor 26 and an amplification variable resistor 27.
そうして、終段オペアンプ24の出力端が最終の電圧出
力端を構成している。Then, the output terminal of the final stage operational amplifier 24 constitutes the final voltage output terminal.
また、圧力が真空度０すなわち圧力0mmH2Ｏのとき出
力電圧をたとえば4.2V、最大圧力時すなわち圧力2000mm
H2Ｏのとき出力電圧をたとえば1.2Vと設定するとき、従
来は、第３図のフローチャートに示す方法で行なってい
る。Also, when the pressure is zero vacuum, that is, the pressure is 0 mmH 2 O, the output voltage is 4.2 V, and when the maximum pressure is the pressure, that is, 2000 mm.
When the output voltage is set to, for example, 1.2 V in the case of H 2 O, conventionally, the method shown in the flowchart of FIG. 3 is used.
まず、電源をオンし、圧力0mmH2Ｏ時に出力調整用可
変抵抗10、増幅用可変抵抗27を調整して終段増幅部23の
出力電圧を4.2Vに設定する（ステップ１）。そして、こ
の状態で最大圧力の圧力2000mmH2Ｏ時に終段増幅部23の
出力電圧が1.2Vであるか否かを判断し（ステップ２）、
1.2Vであるときは圧力0mmH2Ｏ時および圧力2000mmH2Ｏ
時ともに設定電圧となっているので調整を終了する。First, the power supply is turned on, and when the pressure is 0 mmH 2 O, the output adjusting variable resistor 10 and the amplifying variable resistor 27 are adjusted to set the output voltage of the final stage amplifying unit 23 to 4.2V (step 1). Then, in this state, when the maximum pressure is 2000 mmH 2 O, it is judged whether or not the output voltage of the final stage amplifying section 23 is 1.2V (step 2),
When the voltage is 1.2 V, the pressure is 0 mmH 2 O and the pressure is 2000 mmH 2 O
Since it is the set voltage at any time, the adjustment is completed.
また、ステップ２で圧力2000mmH2Ｏ時に終段増幅部23
の出力電圧が1.2Vでないとされたときは、出力調整用可
変抵抗10、増幅用可変抵抗27を調整して終段増幅部23の
出力電圧を1.2Vに設定する（ステップ３）。そして、再
び圧力0mmH2Ｏ時に終段増幅部23の出力電圧が4.2Vであ
るか否かを判断し（ステップ４）、圧力0mmH2Ｏ時の終
段増幅部23の出力電圧も1.2Vであるときは、調整を終了
する。また、ステップ４で圧力0mmH2Ｏ時に終段増幅部2
3の出力電圧が1.2Vでないとき、すなわち、圧力2000mmH
2Ｏ時の出力電圧を1.2Vに調整することにより、圧力0mm
H2Ｏ時の出力電圧の4.2Vが変化してしまったときは、ス
テップ１で圧力0mmH2Ｏ時の出力電圧を4.2Vに設定す
る。In step 2, when the pressure is 2000 mmH 2 O, the final stage amplifier 23
If the output voltage is not 1.2V, the output adjustment variable resistor 10 and the amplification variable resistor 27 are adjusted to set the output voltage of the final stage amplifier 23 to 1.2V (step 3). Then, it is determined whether again or output voltage of the pressure 0 mm H 2 O at the last stage amplifier section 23 is 4.2 V (Step 4), the output voltage of the pressure 0 mm H 2 O at the last stage amplifier section 23 at 1.2V If so, the adjustment ends. Also, when the pressure is 0 mmH 2 O in step 4, the final stage amplifier 2
When the output voltage of 3 is not 1.2V, i.e. pressure 2000mmH
By adjusting the output voltage at 2 O to 1.2 V, the pressure is 0 mm.
If the output voltage of 4.2 V at H 2 O changes, set the output voltage at 0 mmH 2 O at step 1 to 4.2 V in step 1.
そして、上記操作を繰り返し、圧力0mmH2Ｏ時の終段
増幅部23の出力電圧が4.2V、かつ、圧力2000mmH2Ｏ時の
終段増幅部23の出力電圧が1.2Vのときに調整を終了す
る。Then, repeating the above operations, close the adjustment when the output voltage of the pressure 0 mm H 2 O at the last stage amplifier section 23 is 4.2 V, and the output voltage of the pressure 2000mmH 2 O during the last stage amplifier section 23 is 1.2V To do.
（発明が解決しようとする課題） しかしながら、出力調整用可変抵抗10および増幅可変
抵抗27は出力電圧を設定するときには相互に関連するの
で、一方を合わせたのち、他方を調整すると出力電圧が
変化してしまい、それぞれの設定を繰り返さなければな
らないので、調整には多くの時間を費やしている。(Problems to be Solved by the Invention) However, since the output adjustment variable resistor 10 and the amplification variable resistor 27 are related to each other when setting the output voltage, if one is adjusted and the other is adjusted, the output voltage changes. Since I have to repeat each setting, I spend a lot of time adjusting.
本発明は、上記問題点に鑑みされたもので、容易に圧
力センサ回路の出力電圧を調整できる圧力センサ回路に
おける出力電圧調整方法を提供することを目的とする。The present invention has been made in view of the above problems, and an object of the present invention is to provide an output voltage adjusting method in a pressure sensor circuit that can easily adjust the output voltage of the pressure sensor circuit.
（課題を解決するための手段） 請求項１記載の圧力センサ回路における出力電圧調整
方法は、圧力を検出しこの圧力を電気的出力に変換する
圧力検出変換部と、この圧力検出変換部の出力を調整す
る出力調整用可変抵抗と、前記圧力検出変換部が接続さ
れこの圧力変換検出部の出力を増幅する初段増幅部と、
定電圧を出力する定電圧部および抵抗を介してこの初段
増幅部に接続されるとともに増幅用帰還抵抗を有し前記
初段増幅部の電圧を増幅する終段増幅部とを有し、この
終段増幅部の電圧を示す圧力センサ回路で、第１の圧力
時の前記終段増幅部の電圧を第１の設定電圧とし、第２
の圧力時の前記終段増幅部の電圧を第２の設定電圧とす
る場合において、第１の圧力時の前記初段増幅部の電圧
を測定して第１の測定電圧とし、第２の圧力時の前記初
段増幅部の電圧を測定して第２の測定電圧とし、前記第
１の測定電圧および前記第２の測定電圧を用いて前記増
幅用帰還抵抗の抵抗値を計算し、この増幅用帰還抵抗の
抵抗値および前記抵抗の抵抗値を用いて前記初段増幅部
の出力電圧を計算し、前記出力調整用可変抵抗の抵抗値
を調整して第１の圧力時の前記初段増幅部の電圧を計算
による電圧に設定し、前記増幅用帰還抵抗の抵抗値を調
整して第１の圧力時の前記終段増幅部の電圧を第１の設
定電圧に設定するものである。(Means for Solving the Problem) An output voltage adjusting method in a pressure sensor circuit according to claim 1, wherein a pressure detection conversion unit that detects pressure and converts the pressure into an electrical output, and an output of the pressure detection conversion unit. A variable resistor for adjusting output, a first-stage amplifying unit connected to the pressure detecting and converting unit and amplifying the output of the pressure converting and detecting unit,
A constant voltage unit that outputs a constant voltage and a final stage amplifier unit that is connected to the first stage amplifier unit via a resistor and that has a feedback resistor for amplification and that amplifies the voltage of the first stage amplifier unit. In the pressure sensor circuit showing the voltage of the amplification section, the voltage of the final stage amplification section at the first pressure is set to the first set voltage, and the second
In the case of setting the voltage of the final stage amplifying section at the pressure of 2 to the second set voltage, the voltage of the first stage amplifying section at the first pressure is measured to be the first measured voltage, and at the second pressure. The voltage of the first-stage amplifier is measured as a second measurement voltage, the resistance value of the amplification feedback resistor is calculated using the first measurement voltage and the second measurement voltage, and the amplification feedback resistor is calculated. The output voltage of the first-stage amplifier is calculated using the resistance value of the resistor and the resistance value of the resistor, and the resistance value of the output adjustment variable resistor is adjusted to obtain the voltage of the first-stage amplifier at the first pressure. The voltage is set to a calculated value, the resistance value of the amplification feedback resistor is adjusted, and the voltage of the final stage amplification section at the first pressure is set to the first set voltage.
請求項２記載の圧力センサ回路における出力電圧調整
方法は、圧力を検出しこの圧力を電気的出力に変換する
圧力検出変換部と、この圧力検出変換部の出力を調整す
る出力調整用可変抵抗と、前記圧力検出変換部が接続さ
れこの圧力変換検出部の出力を増幅する初段増幅部と、
定電圧を出力する定電圧部および抵抗を介してこの初段
増幅部に接続されるとともに増幅用帰還抵抗を有し前記
初段増幅部の電圧を増幅する終段増幅部とを有し、この
終段増幅部の電圧を示す圧力センサ回路で、第１の圧力
時の前記終段増幅部の電圧を第１の設定電圧とし、第２
の圧力時の前記終段増幅部の電圧を第２の設定電圧とす
る場合において、第１の圧力時の前記初段増幅部の電圧
を測定して第１の測定電圧とし、第２の圧力時の前記初
段増幅部の電圧を測定して第２の測定電圧とし、前記第
１の測定電圧および前記第２の測定電圧を用いて前記増
幅用帰還抵抗の抵抗値を計算し、この増幅用帰還抵抗の
抵抗値および前記抵抗の抵抗値を用いて前記初段増幅部
の出力電圧を計算し、前記出力調整用可変抵抗の抵抗値
を調整して第１の圧力時の前記初段増幅部の電圧を計算
による電圧に設定し、前記増幅用帰還抵抗の抵抗値を調
整して第１の圧力時の前記終段増幅部の電圧を第１の設
定電圧に設定し、第２の圧力時に前記終段増幅部の電圧
が第２の設定電圧であるか否かを測定し、第２の設定電
圧でないときは前記増幅用帰還抵抗の抵抗値を調整して
第２の設定電圧に設定し、前記第１の圧力時に前記終段
増幅部の電圧を第１の設定電圧にし、第１の圧力時に終
段増幅部の電圧が第１の設定電圧に設定され、かつ第２
の圧力時に第２の設定電圧に設定されたときに設定を終
了するものである。An output voltage adjusting method in a pressure sensor circuit according to claim 2, wherein a pressure detecting and converting unit that detects pressure and converts the pressure into an electric output, and an output adjusting variable resistor that adjusts the output of the pressure detecting and converting unit. A first stage amplifying unit connected to the pressure detecting and converting unit for amplifying the output of the pressure converting and detecting unit,
A constant voltage unit that outputs a constant voltage and a final stage amplifier unit that is connected to the first stage amplifier unit via a resistor and that has a feedback resistor for amplification and that amplifies the voltage of the first stage amplifier unit. In the pressure sensor circuit showing the voltage of the amplification section, the voltage of the final stage amplification section at the first pressure is set to the first set voltage, and the second
In the case of setting the voltage of the final stage amplifying section at the pressure of 2 to the second set voltage, the voltage of the first stage amplifying section at the first pressure is measured to be the first measured voltage, and at the second pressure. The voltage of the first-stage amplifier is measured as a second measurement voltage, the resistance value of the amplification feedback resistor is calculated using the first measurement voltage and the second measurement voltage, and the amplification feedback resistor is calculated. The output voltage of the first-stage amplifier is calculated using the resistance value of the resistor and the resistance value of the resistor, and the resistance value of the output adjustment variable resistor is adjusted to obtain the voltage of the first-stage amplifier at the first pressure. The calculated voltage is set, the resistance value of the amplification feedback resistor is adjusted, and the voltage of the final stage amplification section at the first pressure is set to the first set voltage, and the final stage voltage is set at the second pressure. It is measured whether the voltage of the amplifier is the second set voltage, and if it is not the second set voltage, The resistance value of the amplification feedback resistor is adjusted and set to the second set voltage, the voltage of the final stage amplification section is set to the first set voltage at the first pressure, and the final stage amplification section is set at the first pressure. Is set to the first set voltage and the second
When the pressure is set to the second set voltage, the setting is completed.
（作用） 請求項１記載の圧力センサ回路における出力電圧調整
方法は、まず、第１の圧力時の初段増幅部の電圧を測定
して第１の測定電圧とするとともに、第２の圧力時の初
段増幅部の電圧を測定し、次に、第１の測定電圧および
第２の測定電圧を用いて増幅用帰還抵抗の抵抗値を計算
し、この帰還抵抗値および抵抗の抵抗値を用いて初段増
幅部の出力を計算し、そして、出力調整用可変抵抗の抵
抗値を調整して第１の圧力時の初段増幅部の電圧を計算
による電圧に設定し、帰還抵抗の抵抗値を調整して第１
の圧力時の終段増幅部の電圧を第１の設定電圧に設定す
る。(Operation) In the output voltage adjusting method in the pressure sensor circuit according to claim 1, first, the voltage of the first-stage amplifying section at the first pressure is measured to be the first measured voltage, and at the second pressure, The voltage of the first-stage amplifier is measured, and then the resistance value of the amplification feedback resistor is calculated using the first measurement voltage and the second measurement voltage, and the feedback resistance value and the resistance value of the resistor are used to calculate the first stage voltage. Calculate the output of the amplification unit, adjust the resistance value of the output adjustment variable resistor, set the voltage of the first-stage amplification unit at the first pressure to the calculated voltage, and adjust the resistance value of the feedback resistor. First
The voltage of the final stage amplifier at the pressure of 1 is set to the first set voltage.
請求項２記載の圧力センサ回路における出力電圧調整
方法は、まず、第１の圧力時の初段増幅部の電圧を測定
して第１の測定電圧とするとともに、第２の圧力時の初
段増幅部の電圧を測定し、次に、第１の測定電圧および
第２の測定電圧を用いて増幅用帰還抵抗の抵抗値を計算
し、この帰還抵抗値および抵抗の抵抗値を用いて初段増
幅部の出力を計算し、そして、出力調整用可変抵抗の抵
抗値を調整して第１の圧力時の初段増幅部の電圧を計算
による電圧に設定し、帰還抵抗の抵抗値を調整して第１
の圧力時の終段増幅部の電圧を第１の設定電圧に設定
し、さらに、第２の圧力時に終段増幅部の電圧が第２の
設定電圧であるか否かを測定し、第２の設定電圧でない
ときは帰還抵抗の抵抗値を調整して第２の設定電圧に設
定し、第１の圧力時に終段増幅部の電圧を第１の設定電
圧に設定し、第１の圧力時に終段増幅部の電圧が第１の
設定電圧に設定され、かつ、第２の圧力時に第２の設定
電圧に設定されたときに設定が終了し、回路抵抗、抵抗
のばらつきなどによる出力電圧を微調整する。The output voltage adjusting method in the pressure sensor circuit according to claim 2, wherein the voltage of the first-stage amplifying section at the first pressure is first measured to be the first measured voltage, and the first-stage amplifying section at the second pressure is obtained. Of the feedback resistor for amplification is calculated using the first measurement voltage and the second measurement voltage, and the feedback resistance value and the resistance value of the resistor are used to calculate the resistance value of the first-stage amplifier section. The output is calculated, the resistance value of the output adjusting variable resistor is adjusted to set the voltage of the first-stage amplifying section at the first pressure to the calculated voltage, and the resistance value of the feedback resistor is adjusted to adjust the first value.
The voltage of the final stage amplifier at the pressure of 1 is set to the first set voltage, and it is further measured at the second pressure whether or not the voltage of the final stage amplifier is the second set voltage. If it is not set voltage, the resistance value of the feedback resistor is adjusted and set to the second set voltage, the voltage of the final stage amplification section is set to the first set voltage at the first pressure, and the first set voltage is set at the first pressure. When the voltage of the final-stage amplifier is set to the first set voltage and set to the second set voltage at the second pressure, the setting is completed, and the output voltage due to the circuit resistance, the resistance variation, etc. Fine tune.
（実施例） 以下、本発明の一実施例を図面を参照して説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
なお、圧力センサ回路は、従来例の第２図に示す回路
を用いるので説明は省略する。Since the pressure sensor circuit uses the circuit shown in FIG. 2 of the conventional example, description thereof will be omitted.
まず、圧力が第１の圧力である真空度０すなわち圧力
0mmH2Ｏのとき出力電圧VL1をたとえば4.2V、第２の圧力
である最大吸引圧力すなわち圧力2000mmH2Ｏのとき出力
電圧VL2をたとえば1.2Vに設定するときの方法を、第１
図に示すフローチャートを参照して説明する。First, the degree of vacuum, which is the first pressure, is 0, that is, the pressure.
The first method is to set the output voltage VL1 at 0 mmH 2 O to 4.2 V, for example, and the second suction pressure at the maximum suction pressure of 2000 mmH 2 O, for example, to 1.2 V.
This will be described with reference to the flowchart shown in the figure.
出力電圧を調整するに際しては、まず電源をオンす
る。このとき、調整を容易にするため出力調整用可変抵
抗10を可変範囲の中央に設定する（ステップ11）。When adjusting the output voltage, first turn on the power supply. At this time, in order to facilitate the adjustment, the output adjusting variable resistor 10 is set at the center of the variable range (step 11).
まず、5Vの電源１の電圧を測定しE1とする（ステップ
12）。次に、圧力0mmH2Ｏ時の初段増幅部13の電圧を測
定して出力電圧V1とする（ステップ13）とともに、圧力
2000mmH2Ｏ時の初段増幅部13の電圧を測定して出力電圧
V2とする（ステップ14）。そして、抵抗21の抵抗値R1が
2KΩであるので、増幅用帰還抵抗25の抵抗値R2は、 R2＝（VL1×R1−VL2×R1）／（V1−V2） ＝（4.2×２−1.2×２）／（VF1−VF2） ＝6/（VF1−VF2） に代入して求められる（ステップ15）。この帰還抵抗値
R2を使用したときに最も適した圧力0mmH2Ｏ時の初段増
幅部13の出力電圧VF1を、 VF1＝｛（R1＋R2）／（R1×E1）−VL1｝×（R1/R2） ＝｛（２＋R2）/2E1−4.2｝×（2/R2） に代入して計算により求める（ステップ16）。そして、
圧力0mmH2Ｏ時の初段増幅部13の出力電圧を出力調整用
可変抵抗10を可変することにより出力電圧VF1に設定し
（ステップ17）、圧力0mmH2Ｏ時の終段増幅部23の出力
電圧を増幅用可変抵抗27を可変することにより4.2Vに設
定する（ステップ18）。この状態で、圧力2000mmH2Ｏ時
の終段増幅部23の出力電圧VL2が1.2Vであるか否かを判
断し（ステップ19）、出力電圧VL2が1.2Vであるとき
は、圧力0mmH2Ｏ時および圧力2000mmH2Ｏ時ともに設定
電圧となっているので調整を終了する。First, measure the voltage of the 5V power supply 1 and call it E1 (step
12). Next, when the pressure is 0 mmH 2 O, the voltage of the first-stage amplifier 13 is measured and set as the output voltage V1 (step 13), and the pressure is measured.
Measure the voltage of the first stage amplifier 13 at 2000 mmH 2 O and output the voltage.
Set to V2 (step 14). The resistance value R1 of the resistor 21 is
Since it is 2 KΩ, the resistance value R2 of the amplification feedback resistor 25 is R2 = (VL1 × R1−VL2 × R1) / (V1−V2) = (4.2 × 2−1.2 × 2) / (VF1−VF2) = It is obtained by substituting 6 / (VF1-VF2) (step 15). This feedback resistance value
When R2 is used, the output voltage VF1 of the first-stage amplifier 13 when the pressure is 0 mmH 2 O is most suitable, VF1 = {(R1 + R2) / (R1 × E1) −VL1} × (R1 / R2) = {(2 + R2 ) /2E1-4.2} × (2 / R2) and calculate (step 16). And
The output voltage of the first stage amplifier 13 when the pressure is 0 mmH 2 O is set to the output voltage VF1 by changing the output adjustment variable resistor 10 (step 17), and the output voltage of the last stage amplifier 23 when the pressure is 0 mmH 2 O. Is set to 4.2V by changing the variable resistor 27 for amplification (step 18). In this state, it is judged whether or not the output voltage VL2 of the final stage amplifying section 23 when the pressure is 2000 mmH 2 O is 1.2 V (step 19), and when the output voltage VL2 is 1.2 V, the pressure is 0 mmH 2 O. The adjustment is completed because the set voltage has been reached at both the time and the pressure of 2000 mmH 2 O.
また、回路抵抗、抵抗素子のばらつきなどにより、ス
テップ19で出力電圧VL2が4.2Vでないときは、出力電圧V
L2が1.2Vより低いか否かを判断し（ステップ20）、1.2V
より低くないときは、増幅用帰還抵抗25の抵抗値を大き
くして出力電圧VL2を1.2Vとし（ステップ21）、1.2Vよ
り低いときは増幅用帰還抵抗25の抵抗値を小さくして出
力電圧VL2を1.2Vとし（ステップ22）、そして、圧力0mm
H2Ｏ時の終段増幅部23の出力を出力調整用可変抵抗10を
可変して出力電圧VL1を4.2Vとする（ステップ23）。そ
うして、圧力0mmH2Ｏ時の出力電圧が4.2Vになるととも
に圧力2000mmH2Ｏ時の出力電圧が1.2Vになったとき調整
を終了する。Also, if the output voltage VL2 is not 4.2V in step 19 due to variations in circuit resistance and resistance elements, etc., the output voltage V
Determine if L2 is less than 1.2V (step 20), 1.2V
If not lower, increase the resistance value of the amplification feedback resistor 25 to set the output voltage VL2 to 1.2V (step 21). If it is lower than 1.2V, decrease the resistance value of the amplification feedback resistor 25 to reduce the output voltage. Set VL2 to 1.2V (step 22), and pressure 0mm
The output of the final stage amplifier 23 at the time of H 2 O is changed by the output adjusting variable resistor 10 to set the output voltage VL1 to 4.2V (step 23). Then, the output voltage at the time of pressure 2000mmH 2 O with the output voltage at the time of the pressure 0 mm H 2 O becomes 4.2V to end the adjustment when it becomes 1.2V.
上記実施例によれば、製品ばらつきの大きい圧力セン
サ４でも容易に調整を行なうことができる。According to the above-described embodiment, the pressure sensor 4 having a large product variation can be easily adjusted.
請求項１記載のオペアンプ回路の出力電圧調整方法に
よれば、測定値に基づき計算で一定の調整を行なうこと
により、容易に調整を行なうことができるので、たとえ
ばコンピュータ等による自動調整も可能とする。According to the output voltage adjusting method of the operational amplifier circuit of the first aspect, the adjustment can be easily performed by performing the constant adjustment by calculation based on the measured value. Therefore, for example, automatic adjustment by a computer or the like is also possible. .
請求項２記載のオペアンプ回路の出力電圧調整方法に
よれば、測定値に基づき計算で一定の調整を行なうこと
により、容易に調整を行なうことができるので、たとえ
ばコンピュータ等による自動調整も可能となり、さら
に、回路抵抗、各抵抗素子などのばらつきにの基づく微
調整を行なうことにより正確に出力電圧を調整できる。According to the output voltage adjusting method of the operational amplifier circuit of the second aspect, since the adjustment can be easily performed by performing the constant adjustment by calculation based on the measured value, the automatic adjustment by, for example, a computer or the like is also possible. Further, the output voltage can be accurately adjusted by performing fine adjustment based on variations in circuit resistance, resistance elements, and the like.
第１図は本発明の一実施例を示すフローチャート、第２
図は同上圧力センサ回路を示す回路図、第３図は従来例
を示すフローチャートである。 ４……圧力検出変換部としての圧力センサ、10……出力
調整用可変抵抗、13……初段増幅部、16……定電圧部と
してのオペアンプ、21……抵抗、23……終段増幅部、25
……増幅用帰還抵抗。FIG. 1 is a flow chart showing an embodiment of the present invention,
FIG. 3 is a circuit diagram showing the above pressure sensor circuit, and FIG. 3 is a flow chart showing a conventional example. 4 ... Pressure sensor as pressure detection conversion unit, 10 ... Variable resistor for output adjustment, 13 ... First stage amplification unit, 16 ... Operational amplifier as constant voltage unit, 21 ... Resistor, 23 ... Final stage amplification unit ,twenty five
...... Amplification feedback resistor.
Claims (2)
する圧力検出変換部と、この圧力検出変換部の出力を調
整する出力調整用可変抵抗と、前記圧力検出変換部が接
続されこの圧力変換検出部の出力を増幅する初段増幅部
と、定電圧を出力する定電圧部および抵抗を介してこの
初段増幅部に接続されるとともに増幅用帰還抵抗を有し
前記初段増幅部の電圧を増幅する終段増幅部とを有し、
この終段増幅部の電圧を示す圧力センサ回路で、第１の
圧力時の前記終段増幅部の電圧を第１の設定電圧とし、
第２の圧力時の前記終段増幅部の電圧を第２の設定電圧
とする場合において、 第１の圧力時の前記初段増幅部の電圧を測定して第１の
測定電圧とし、 第２の圧力時の前記初段増幅部の電圧を測定して第２の
測定電圧とし、 前記第１の測定電圧および前記第２の測定電圧を用いて
前記増幅用帰還抵抗の抵抗値を計算し、 この増幅用帰還抵抗の抵抗値および前記抵抗の抵抗値を
用いて前記初段増幅部の出力電圧を計算し、 前記出力調整用可変抵抗の抵抗値を調整して第１の圧力
時の前記初段増幅部の電圧を計算による電圧に設定し、 前記増幅用帰還抵抗の抵抗値を調整して第１の圧力時の
前記終段増幅部の電圧を第１の設定電圧に設定する ことを特徴とする圧力センサ回路における出力電圧調整
方法。1. A pressure detection conversion unit for detecting pressure and converting the pressure into an electric output, an output adjustment variable resistor for adjusting the output of the pressure detection conversion unit, and the pressure detection conversion unit are connected. A first-stage amplification section that amplifies the output of the pressure conversion detection section, and a constant-voltage section that outputs a constant voltage and a resistor connected to this first-stage amplification section through a resistor and have a feedback resistor for amplification to And a final-stage amplification section for amplification,
In the pressure sensor circuit showing the voltage of the final stage amplification section, the voltage of the final stage amplification section at the first pressure is set to the first set voltage,
When the voltage of the final stage amplifier at the second pressure is set to the second set voltage, the voltage of the first stage amplifier at the first pressure is measured and set as the first measured voltage, The voltage of the first-stage amplifying section at the time of pressure is measured to be a second measurement voltage, and the resistance value of the amplification feedback resistor is calculated using the first measurement voltage and the second measurement voltage, The output voltage of the first-stage amplifier is calculated using the resistance value of the feedback resistor and the resistance value of the resistor, and the resistance value of the output-adjusting variable resistor is adjusted to adjust the resistance value of the first-stage amplifier at the first pressure. The pressure sensor is characterized in that the voltage is set to a calculated voltage, and the resistance value of the amplification feedback resistor is adjusted to set the voltage of the final stage amplification section at the first pressure to the first set voltage. Output voltage adjustment method in a circuit.
する圧力検出変換部と、この圧力検出変換部の出力を調
整する出力調整用可変抵抗と、前記圧力検出変換部が接
続されこの圧力変換検出部の出力を増幅する初段増幅部
と、定電圧を出力する定電圧部および抵抗を介してこの
初段増幅部に接続されるとともに増幅用帰還抵抗を有し
前記初段増幅部の電圧を増幅する終段増幅部とを有し、
この終段増幅部の電圧を示す圧力センサ回路で、第１の
圧力時の前記終段増幅部の電圧を第１の設定電圧とし、
第２の圧力時の前記終段増幅部の電圧を第２の設定電圧
とする場合において、第１の圧力時の前記初段増幅部の
電圧を測定して第１の測定電圧とし、第２の圧力時の前
記初段増幅部の電圧を測定して第２の測定電圧とし、 前記第１の測定電圧および前記第２の測定電圧を用いて
前記増幅用帰還抵抗の抵抗値を計算し、 この増幅用帰還抵抗の抵抗値および前記抵抗の抵抗値を
用いて前記初段増幅部の出力電圧を計算し、 前記出力調整用可変抵抗の抵抗値を調整して第１の圧力
時の前記初段増幅部の電圧を計算による電圧に設定し、 前記増幅用帰還抵抗の抵抗値を調整して第１の圧力時の
前記終段増幅部の電圧を第１の設定電圧に設定し、 第２の圧力時に前記終段増幅部の電圧が第２の設定電圧
であるか否かを測定し、 第２の設定電圧でないときは前記増幅用帰還抵抗の抵抗
値を調整して第２の設定電圧に設定し、前記第１の圧力
時に前記終段増幅部の電圧を第１の設定電圧にし、 第１の圧力時に終段増幅部の電圧が第１の設定電圧に設
定され、かつ第２の圧力時に第２の設定電圧に設定され
たときに設定を終了する ことを特徴とする圧力センサ回路における出力電圧調整
方法。2. A pressure detecting and converting section for detecting pressure and converting the pressure into an electric output, an output adjusting variable resistor for adjusting the output of the pressure detecting and converting section, and the pressure detecting and converting section are connected. A first-stage amplification section that amplifies the output of the pressure conversion detection section, and a constant-voltage section that outputs a constant voltage and a resistor connected to this first-stage amplification section through a resistor and have a feedback resistor for amplification to And a final-stage amplification section for amplification,
In the pressure sensor circuit showing the voltage of the final stage amplification section, the voltage of the final stage amplification section at the first pressure is set to the first set voltage,
In the case where the voltage of the final stage amplification section at the second pressure is the second set voltage, the voltage of the first stage amplification section at the first pressure is measured and set as the first measurement voltage, The voltage of the first-stage amplifying section at the time of pressure is measured to be a second measurement voltage, and the resistance value of the amplification feedback resistor is calculated using the first measurement voltage and the second measurement voltage, The output voltage of the first-stage amplifier is calculated using the resistance value of the feedback resistor and the resistance value of the resistor, and the resistance value of the output-adjusting variable resistor is adjusted to adjust the resistance value of the first-stage amplifier at the first pressure. The voltage is set to the calculated voltage, the resistance value of the amplification feedback resistor is adjusted to set the voltage of the final stage amplification unit at the first pressure to the first set voltage, and the voltage at the second pressure is set to the above. It is measured whether the voltage of the final stage amplifier is the second set voltage, and it is not the second set voltage. If the resistance value of the amplification feedback resistor is adjusted to a second set voltage, the voltage of the final stage amplifier is set to the first set voltage at the first pressure, and the end voltage is set at the first pressure. An output voltage adjusting method in a pressure sensor circuit, characterized in that the setting is terminated when the voltage of the stage amplifier is set to the first set voltage and set to the second set voltage at the second pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63050449A JP2501224B2 (en) | 1988-03-03 | 1988-03-03 | Output voltage adjustment method in pressure sensor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63050449A JP2501224B2 (en) | 1988-03-03 | 1988-03-03 | Output voltage adjustment method in pressure sensor circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01223322A JPH01223322A (en) | 1989-09-06 |
| JP2501224B2 true JP2501224B2 (en) | 1996-05-29 |
Family
ID=12859172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63050449A Expired - Fee Related JP2501224B2 (en) | 1988-03-03 | 1988-03-03 | Output voltage adjustment method in pressure sensor circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2501224B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5146788A (en) * | 1990-10-25 | 1992-09-15 | Becton, Dickinson And Company | Apparatus and method for a temperature compensation of a catheter tip pressure transducer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61169732A (en) * | 1985-01-22 | 1986-07-31 | Seiko Instr & Electronics Ltd | Quartz type gas barometer |
| JPS61215934A (en) * | 1985-03-22 | 1986-09-25 | Yokogawa Electric Corp | Semiconductor pressure converting device |
| JPH0519796Y2 (en) * | 1986-02-12 | 1993-05-25 |
-
1988
- 1988-03-03 JP JP63050449A patent/JP2501224B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01223322A (en) | 1989-09-06 |
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