JPH0718711B2 - Potentiometer input circuit - Google Patents
Potentiometer input circuitInfo
- Publication number
- JPH0718711B2 JPH0718711B2 JP1954990A JP1954990A JPH0718711B2 JP H0718711 B2 JPH0718711 B2 JP H0718711B2 JP 1954990 A JP1954990 A JP 1954990A JP 1954990 A JP1954990 A JP 1954990A JP H0718711 B2 JPH0718711 B2 JP H0718711B2
- Authority
- JP
- Japan
- Prior art keywords
- potentiometer
- electric wire
- operational amplifier
- voltage
- slider
- 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.)
- Expired - Lifetime
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 この発明はポテンショメータの両端間に電圧を印加し、
そのポテンショメータの摺動子に第１電線の一端を接続
し、その第１電線の他端からその摺動子の位置と対応し
た信号を取り出すポテンショメータ入力回路に関する。DETAILED DESCRIPTION OF THE INVENTION "Industrial application" The present invention applies a voltage across a potentiometer,
It relates to a potentiometer input circuit in which one end of a first electric wire is connected to a slider of the potentiometer and a signal corresponding to the position of the slider is taken out from the other end of the first electric wire.
「従来の技術」 第２図に従来のポテンショメータ入力回路を示す。ポテ
ンショメータ11の摺動子12に第１電線13の一端が接続さ
れ、ポテンショメータ11の一端に第２電線14を通じて定
電圧源15の一端が接続され、ポテンショメータ11の他端
に第３電線16を通じて定電圧源15の他端が接続されて、
ポテンショメータ11の両端間に定電圧が印加され、摺動
子12の摺動位置に応じた信号が第１電線13の他端の出力
端子17に取り出されるように構成されている。"Prior Art" FIG. 2 shows a conventional potentiometer input circuit. One end of the first electric wire 13 is connected to the slider 12 of the potentiometer 11, one end of the constant voltage source 15 is connected to one end of the potentiometer 11 through the second electric wire 14, and the other end of the potentiometer 11 is connected through the third electric wire 16. The other end of the voltage source 15 is connected,
A constant voltage is applied between both ends of the potentiometer 11, and a signal according to the sliding position of the slider 12 is taken out to the output terminal 17 at the other end of the first electric wire 13.
「発明が解決しようとする課題」 定電圧源15および出力端子17とポテンショメータ11とを
都合により互いに離して設ける場合は、第１、第２、第
３電線13,14,16の各長さが長くなると、これら電線の各
抵抗値が無視できなくなる。例えば摺動子12が第２電線
14との接続点側の端に位置されていると、本来は（電線
の抵抗が無視できれば）出力端子17の電圧は定電圧源15
の電圧E1が出力されるべきであるが、第２電線14の抵抗
が無視できないと、この抵抗による電圧降下分だけE1よ
りも低い電圧が出力端子17に現れる。摺動子12が他の位
置にある場合も、同様の問題が生じ、出力端子17の電圧
で摺動子12の正しい位置を知ることができない。[Problems to be Solved by the Invention] When the constant voltage source 15 and the output terminal 17 and the potentiometer 11 are provided separately from each other for convenience, the respective lengths of the first, second and third electric wires 13, 14, 16 are As the length increases, the resistance values of these wires cannot be ignored. For example, the slider 12 is the second electric wire
If it is located at the end on the side of the connection point with 14, the voltage of the output terminal 17 should be constant voltage source 15 (if the resistance of the wire can be ignored).
Of it the voltage E 1 is to be output, the resistance of the second electric wire 14 is not negligible, a voltage lower than the voltage drop by E 1 according to the resistance appears at the output terminal 17. The same problem occurs when the slider 12 is in another position, and the correct position of the slider 12 cannot be known from the voltage of the output terminal 17.
この問題を解決するため、従来においてはポテンショメ
ータ11としてその全抵抗値が各電線の抵抗値より十分大
きなものを使用していた。しかし、ポテンショメータ11
により摺動子12の位置信号を得ると共に、ポテンショメ
ータ11に比較的大きい電流を流し、その電流でリレーな
どを制御する場合があり、このような場合はポテンショ
メータ11として全抵抗値が高いものを使用することがで
きない。また摺動子12の位置検出精度がそれ程要求され
ないため、安価な低抵抗のポテンショメータを使用して
いたが、後において高い検出精度が要求されるようにな
ると、抵抗値の高いポテンショメータと交換する必要が
生じ、ポテンショメータが複雑な装置内に組み込まれて
いたり、設置場所などによってはその交換が困難な場合
がある。In order to solve this problem, conventionally, a potentiometer 11 whose total resistance value is sufficiently larger than the resistance value of each electric wire has been used. However, the potentiometer 11
In addition to obtaining the position signal of the slider 12, a relatively large current may flow through the potentiometer 11 to control the relay etc. with such a current.In such a case, use a potentiometer 11 with a high total resistance value. Can not do it. Also, since the position detection accuracy of the slider 12 is not so required, an inexpensive low resistance potentiometer was used, but if high detection accuracy is required later, it is necessary to replace it with a potentiometer with a high resistance value. May occur, and it may be difficult to replace the potentiometer in a complicated device or depending on the installation location.
「課題を解決するための手段」 この発明によれば、ポテンショメータの摺動子位置に応
じた信号を取り出す出力端子位置付近に演算増幅器が設
けられ、その演算増幅器の非反転入力端に定電圧源が接
続され、出力端が第２電線を通じてポテンショメータの
一端に接続されると共に、その出力端と反転入力端との
間に第１抵抗器が接続される。ポテンショメータの他端
は第３電線を通じて、出力端子位置付近に設けられた定
電流源に接続され、定電流源および第３電線の接続点は
第２抵抗器を通じて演算増幅器の反転入力端に接続され
る。第１、第２抵抗器の各抵抗値は互いに等しく、かつ
ポテンショメータの全抵抗値より十分大に選定される。[Means for Solving the Problems] According to the present invention, an operational amplifier is provided near the output terminal position for extracting a signal corresponding to the slider position of the potentiometer, and a constant voltage source is provided at the non-inverting input terminal of the operational amplifier. Is connected, the output end is connected to one end of the potentiometer through the second electric wire, and the first resistor is connected between the output end and the inverting input end. The other end of the potentiometer is connected through a third wire to a constant current source provided near the output terminal position, and the connection point of the constant current source and the third wire is connected to the inverting input terminal of the operational amplifier through the second resistor. It The resistance values of the first and second resistors are equal to each other and are selected sufficiently larger than the total resistance value of the potentiometer.
「実施例」 第１図にこの発明の実施例を示し、第２図と対応する部
分に同一符号を付けてある。この発明では出力端子17の
位置付近に演算増幅器21および定電流源22が設けられ、
定電圧源15は第２電線14ではなく、演算増幅器21の非反
転入力端に接続され、第２電線14は定電圧源15ではなく
演算増幅器21の出力端に接続され、演算増幅器21の出力
端と反転入力端との間に第１抵抗器23が接続される。第
３電線16は定電圧源15の他端ではなく、定電流源22に接
続され、定電流源22および第３電線16の接続点は第２抵
抗器24を通じて演算増幅器21の反転入力端に接続され
る。定電圧源15および定電流源22の各他端は接地され
る。第１、第２抵抗器23、24の各抵抗値は互いに等しい
Raとされ、かつポテンショメータ11の全抵抗値Rbより十
分大、例えば1000倍とされる。演算増幅器21の出力電圧
の極性と、定電流源22の極性とは同一とされる。つま
り、この例では定電圧源15の正電圧E1が演算増幅器21の
非反転入力端に印加され、演算増幅器21の出力は正電圧
となり、定電流源22は第３電線16から電流を吸い込むよ
うにする。[Embodiment] FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 2 are designated by the same reference numerals. In the present invention, the operational amplifier 21 and the constant current source 22 are provided near the position of the output terminal 17,
The constant voltage source 15 is connected not to the second electric wire 14 but to the non-inverting input terminal of the operational amplifier 21, and the second electric wire 14 is connected not to the constant voltage source 15 but to the output terminal of the operational amplifier 21 and the output of the operational amplifier 21. A first resistor 23 is connected between the end and the inverting input end. The third wire 16 is connected not to the other end of the constant voltage source 15 but to the constant current source 22, and the connection point of the constant current source 22 and the third wire 16 is connected to the inverting input terminal of the operational amplifier 21 through the second resistor 24. Connected. The other ends of the constant voltage source 15 and the constant current source 22 are grounded. The resistance values of the first and second resistors 23 and 24 are equal to each other.
It is set to Ra and is sufficiently larger than the total resistance value Rb of the potentiometer 11, for example, 1000 times. The polarity of the output voltage of the operational amplifier 21 and the polarity of the constant current source 22 are the same. That is, in this example, the positive voltage E 1 of the constant voltage source 15 is applied to the non-inverting input terminal of the operational amplifier 21, the output of the operational amplifier 21 becomes a positive voltage, and the constant current source 22 absorbs the current from the third electric wire 16. To do so.
この構成によれば、第１、第２抵抗器23,24の抵抗値Ra
がポテンショメータ11の抵抗値Rbより十分大きいから、
第１、第２抵抗器23,24を流れる電流は無視され、ポテ
ンショメータ11に流れる電流が定電流源22の定電流I1と
等しくなる。第１抵抗器23を通じる演算増幅器21の帰還
作用により、演算増幅器21の非反転入力端と反転入力端
との電圧差がなくなるように動作するため、演算増幅器
21の反転入力端、つまり、第１、第２抵抗器23,24の接
続点25は定電圧源15の電圧E1と等しくなる。第１、第２
抵抗器23,24の直列接続の両端が第２、第３電線14,16の
各ポテンショメータ11と反対側の端にそれぞれ接続さ
れ、また、第２、第３電線14,16はほゞ同一長でその各
抵抗値はほゞ等しいから、ポテンショメータ11の中点の
電圧はE1と等しくなる。従って、ポテンショメータ11の
第２電線14側の端の電圧Vb1は となり、ポテンショメータ11の第３電線16側の端の電圧
Vb2は となる。つまりVb1，Vb2は第２、第３電線14,16の各抵
抗値に無関係で、定電圧源15の電圧E1と、定電流源22の
定電流I1と、ポテンショメータ11の全抵抗値Rbとにより
決まり、摺動子12の位置に応じてVb1とVb2との間の電圧
が出力端子17に出力される。According to this configuration, the resistance values R a of the first and second resistors 23 and 24 are
Is sufficiently larger than the resistance value R b of potentiometer 11,
The current flowing through the first and second resistors 23, 24 is ignored, and the current flowing through the potentiometer 11 becomes equal to the constant current I 1 of the constant current source 22. Due to the feedback action of the operational amplifier 21 through the first resistor 23, the operational amplifier 21 operates so as to eliminate the voltage difference between the non-inverting input terminal and the inverting input terminal thereof.
The inverting input terminal of 21, that is, the connection point 25 of the first and second resistors 23 and 24 becomes equal to the voltage E 1 of the constant voltage source 15. First, second
Both ends of the series connection of the resistors 23 and 24 are respectively connected to the ends of the second and third electric wires 14 and 16 on the opposite side of the potentiometer 11, and the second and third electric wires 14 and 16 have substantially the same length. Since the respective resistance values are almost equal, the voltage at the midpoint of the potentiometer 11 becomes equal to E 1 . Therefore, the voltage V b1 at the end of the potentiometer 11 on the second electric wire 14 side is And the voltage at the end of the potentiometer 11 on the side of the third wire 16
V b2 is Becomes That is, V b1 and V b2 are irrelevant to the resistance values of the second and third electric wires 14 and 16, and the voltage E 1 of the constant voltage source 15, the constant current I 1 of the constant current source 22 and the total resistance of the potentiometer 11 are set. The value is determined by the value R b, and the voltage between V b1 and V b2 is output to the output terminal 17 depending on the position of the slider 12.
「発明の効果」 以上述べたように、この発明によれば、出力端子17の位
置付近に演算増幅器21、定電流源22、第１、第２抵抗器
23,24を設けることにより、第１、第２、第３電線13,1
4,16の長さに無関係に、ポテンショメータ11の両端電圧
が、定電圧E1と定電流I1とポテンショメータ11の全抵抗
値Rbとのみにより決まり、全抵抗値Rbの小さいポテンシ
ョメータを使用しても電線抵抗に影響されることなく、
正しい摺動子位置を検出することができる。また既存の
装置に対し、ポテンショメータを交換することなく、出
力端子17の位置付近にある演算増幅器、定電流源、第
１、第２抵抗器を接続および接続変更を行って、容易に
検出精度を高くすることができる。"Effects of the Invention" As described above, according to the present invention, the operational amplifier 21, the constant current source 22, the first and second resistors are provided near the position of the output terminal 17.
By providing 23,24, the first, second and third electric wires 13,1
Regardless of the length of 4,16, the voltage across the potentiometer 11 is determined only by the constant voltage E 1 , the constant current I 1 and the total resistance value R b of the potentiometer 11, and a potentiometer with a small total resistance value R b is used. Even without being affected by the wire resistance,
The correct slider position can be detected. In addition, the detection accuracy can be easily improved by connecting and changing the operational amplifier, the constant current source, the first and second resistors near the position of the output terminal 17 to the existing device without replacing the potentiometer. Can be higher.
第１図はこの発明の実施例を示す接続図、第２図は従来
のポテンショメータ入力回路を示す接続図である。FIG. 1 is a connection diagram showing an embodiment of the present invention, and FIG. 2 is a connection diagram showing a conventional potentiometer input circuit.
Claims (1)
し、そのポテンショメータの摺動子に第１電線の一端を
接続し、その第１電線の他端から上記摺動子の位置と対
応した信号を取り出すポテンショメータ入力回路におい
て、 上記第１電線の他端の位置付近に演算増幅器が設けら
れ、 その演算増幅器の非反転入力端は定電圧源に接続され、
出力端はその反転入力端に第１抵抗器を通じて接続され
ると共に、第２電線を通じて上記ポテンショメータの一
端に接続され、 上記ポテンショメータの他端は第３電線を通じて、上記
第１電線の他端の位置付近に設けられた定電流源に接続
され、 その定電流源および上記第３電線の接続点は第２抵抗器
を通じて上記演算増幅器の反転入力端に接続され、 上記第１、第２抵抗器の各抵抗値は互いに等しく、かつ
上記ポテンショメータの全抵抗値より十分大に選定され
ていることを特徴とするポテンショメータ入力回路。1. A voltage is applied between both ends of a potentiometer, one end of a first electric wire is connected to a slider of the potentiometer, and a signal corresponding to the position of the slider is sent from the other end of the first electric wire. In the potentiometer input circuit to be taken out, an operational amplifier is provided near the position of the other end of the first electric wire, and the non-inverting input end of the operational amplifier is connected to a constant voltage source,
The output end is connected to the inverting input end through the first resistor and is also connected to one end of the potentiometer through the second electric wire, and the other end of the potentiometer is through the third electric wire and the position of the other end of the first electric wire. It is connected to a constant current source provided in the vicinity, and the connection point of the constant current source and the third electric wire is connected to the inverting input terminal of the operational amplifier through the second resistor, and the first and second resistors are connected. A potentiometer input circuit, wherein each resistance value is equal to each other and is selected sufficiently larger than the total resistance value of the potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1954990A JPH0718711B2 (en) | 1990-01-29 | 1990-01-29 | Potentiometer input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1954990A JPH0718711B2 (en) | 1990-01-29 | 1990-01-29 | Potentiometer input circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03223619A JPH03223619A (en) | 1991-10-02 |
| JPH0718711B2 true JPH0718711B2 (en) | 1995-03-06 |
Family
ID=12002398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1954990A Expired - Lifetime JPH0718711B2 (en) | 1990-01-29 | 1990-01-29 | Potentiometer input circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0718711B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001215102A (en) * | 2000-02-03 | 2001-08-10 | Mikuni Corp | Position detection device |
| CN110953976B (en) * | 2019-12-03 | 2025-02-18 | 北京星际荣耀空间科技股份有限公司 | Motor rotor position detection circuit and system |
-
1990
- 1990-01-29 JP JP1954990A patent/JPH0718711B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03223619A (en) | 1991-10-02 |
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