JPH0243234B2 - - Google Patents
Info
- Publication number
- JPH0243234B2 JPH0243234B2 JP56136827A JP13682781A JPH0243234B2 JP H0243234 B2 JPH0243234 B2 JP H0243234B2 JP 56136827 A JP56136827 A JP 56136827A JP 13682781 A JP13682781 A JP 13682781A JP H0243234 B2 JPH0243234 B2 JP H0243234B2
- Authority
- JP
- Japan
- Prior art keywords
- input
- voltage
- converter
- amplifier
- resistor
- 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
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- Arrangements For Transmission Of Measured Signals (AREA)
Description
【発明の詳細な説明】
本発明はプロセス制御に適用される変換器に関
し、特に、正負２入力線に直流の電気信号が入力
される２線式変換器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a converter applied to process control, and particularly to a two-wire converter in which a DC electrical signal is input to two positive and negative input lines.
一般に、従来の変換器は演算増幅器駆動用の直
流電源部を必要とした。 Generally, conventional converters require a DC power supply section for driving an operational amplifier.
本発明の目的は、演算増幅器駆動用の直流電源
部を設けず、入力信号から増幅器駆動用電源と変
換器入力電圧を分離することができ、もつて電流
入力信号から電源信号と入力電圧信号の双方を得
ることのできる変換器を提供することにある。 An object of the present invention is to be able to separate the power supply for driving the amplifier and the input voltage of the converter from the input signal without providing a DC power supply section for driving the operational amplifier. The object is to provide a converter that can obtain both.
以下、本発明を電−空変換器に実施した例につ
いて説明する。 An example in which the present invention is implemented in an electro-pneumatic converter will be described below.
図面は本発明実施例の回路図である。入力端子
１，２間へは、外部からプロセス制御の標準信号
である約10ボルト・４〜20ｍＡの直流信号が印加
される。入力端子１，２間にはツエナーダイオー
ドZ1と感度調整用可変抵抗器Rsが直列接続され、
このツエナーダイオードZ1の両端から直流電源＋
Ｖ及び−Ｖが取り出される。また、入力電流によ
り感度調整用可変抵抗器Rsの両端に電圧が発生
するが、この電圧信号は以下に示すような入力回
路３に取り出される。すなわち、ツエナーダイオ
ードZ1の両端に抵抗R1とツエナーダイオードZ2
を直列接続して、ツエナーダイオードZ2の端子Ｂ
点から、より安定した定電圧を取り出し得るよう
構成している。点Ｂ（又は点Ａ）の基準点と負の
入力端子２の間に抵抗R2と抵抗R3の直列回路を
接続し、その接続点Ｃから入力電圧を取り出して
いる。抵抗R1，R2，R3及びツエナーダイオード
Z2の回路網が入力回路３を構成している。 The drawing is a circuit diagram of an embodiment of the present invention. A DC signal of approximately 10 volts and 4 to 20 mA, which is a standard signal for process control, is applied between input terminals 1 and 2 from the outside. A Zener diode Z 1 and a variable resistor R s for sensitivity adjustment are connected in series between input terminals 1 and 2.
DC power supply + from both ends of this Zener diode Z1
V and -V are taken out. Further, a voltage is generated across the sensitivity adjustment variable resistor R s due to the input current, and this voltage signal is taken out to the input circuit 3 as shown below. That is, resistor R 1 and Zener diode Z 2 across Zener diode Z 1
Connect in series and connect terminal B of Zener diode Z2.
The structure is such that a more stable constant voltage can be obtained from this point. A series circuit of a resistor R 2 and a resistor R 3 is connected between the reference point of point B (or point A) and the negative input terminal 2, and the input voltage is taken out from the connection point C. Resistors R 1 , R 2 , R 3 and Zener diodes
The circuit network Z2 constitutes the input circuit 3.
点Ｃの入力電圧は積分アンプ４及び比例アンプ
５によりPI演算され、その出力電圧が圧電素子
６に印加される。圧電素子６は印加電圧の大きさ
に応じてフラツパが歪曲し、ノズル１１との空隙
が変化し、その結果、ノズル１１の背圧が変化す
る。パイロツト弁７はこの背圧の変化を増幅し、
空気出力の圧力を0.2〜1.0Kg／cm2の範囲で変化さ
せる。圧力センサ８は半導体式圧力センサであつ
て、センサ電源９により駆動され、圧力変化に応
じてＤ点及びＥ点の電圧が変化する。フイードバ
ツクアンプ１０は圧力センサの出力信号を増幅
し、積分アンプ４及び比例アンプ５にフイードバ
ツクして入力電圧にバランスさせる。フイードバ
ツクアンプの入力端にバイアス電圧を与える可変
抵抗器Rzはゼロ調整用として用いられ、比例ア
ンプ５の出力端に接続されている可変抵抗器RG
はゲイン調整用として用いられる。なお、積分ア
ンプ４、比例アンプ５、フイードバツクアンプ１
０はいずれも消費電力の少ないものが用いられ
る。 The input voltage at point C is subjected to PI calculation by the integral amplifier 4 and the proportional amplifier 5, and the output voltage is applied to the piezoelectric element 6. The flap of the piezoelectric element 6 is distorted depending on the magnitude of the applied voltage, and the gap between the piezoelectric element 6 and the nozzle 11 changes, and as a result, the back pressure of the nozzle 11 changes. The pilot valve 7 amplifies this change in back pressure,
Change the air output pressure in the range of 0.2 to 1.0Kg/ cm2 . The pressure sensor 8 is a semiconductor pressure sensor, and is driven by a sensor power source 9, and the voltages at points D and E change according to pressure changes. Feedback amplifier 10 amplifies the output signal of the pressure sensor and feeds it back to integral amplifier 4 and proportional amplifier 5 to balance it with the input voltage. The variable resistor Rz that applies a bias voltage to the input end of the feedback amplifier is used for zero adjustment, and the variable resistor R G connected to the output end of the proportional amplifier 5
is used for gain adjustment. In addition, integral amplifier 4, proportional amplifier 5, and feedback amplifier 1
0 with low power consumption is used.
このような構成において、入力端子に入力信号
が印加され、４〜20ｍＡの入力電流が流入する
と、ツエナーダイオードZ1と感度調整用可変抵抗
器Rsとの直列回路によつて、この入力信号は、
直流電源電圧＋Ｖ，−Ｖと、入力電圧に分割され
る。積分アンプ４は入力電圧を抵抗R4を通して
入力に取り込み、フイードバツク信号を入力
に取り込んでその差を積分演算する。比例アンプ
５は入力電圧を抵抗R5を通して入力に取り込
み、積分出力及びフイードバツク信号をそれぞれ
抵抗R6及び抵抗R7を通して入力に取り込み、
その差を比例演算する。系がバランスしている状
態で入力端子１，２の電流が増大すると、Ｃ点の
電圧付コモンレベルに対して負方向に増大し、比
例アンプ５の出力電圧が増大してノズル１１の背
圧及び空気出力が増大して電気−空気変換が行な
われる。空気出力が増大すると圧力センサ８のＤ
点のレベルが減少し、フイードバツクアンプ１０
の出力レベルが負方向に増大するから、入力電圧
と空気出力がバランスする状態に圧電素子６の状
態が維持される。 In such a configuration, when an input signal is applied to the input terminal and an input current of 4 to 20 mA flows in , this input signal is ,
It is divided into DC power supply voltage +V, -V and input voltage. Integrating amplifier 4 inputs the input voltage through resistor R4 , inputs the feedback signal, and performs an integral operation on the difference. The proportional amplifier 5 takes the input voltage into the input through the resistor R5 , and takes the integral output and feedback signal into the input through the resistors R6 and R7 , respectively.
The difference is calculated proportionally. When the current at input terminals 1 and 2 increases while the system is balanced, it increases in the negative direction with respect to the voltage common level at point C, the output voltage of proportional amplifier 5 increases, and the back pressure of nozzle 11 increases. and the pneumatic output is increased to provide electrical-to-air conversion. When the air output increases, the D of the pressure sensor 8
The level of the point decreases and the feedback amplifier 10
Since the output level of the piezoelectric element 6 increases in the negative direction, the state of the piezoelectric element 6 is maintained in a state where the input voltage and the air output are balanced.
以上、電−空変換器について説明したが、本発
明は、圧電素子、パイロツト弁、圧力センサに替
えて、電圧により駆動される他のセンサに対して
も同様に実施することができる。 Although the electro-pneumatic converter has been described above, the present invention can be similarly implemented with other sensors driven by voltage instead of piezoelectric elements, pilot valves, and pressure sensors.
以上説明したように、本発明によれば、プロセ
ス制御の標準信号等の電流信号が入力される入力
端子に、ツエナーダイオードと抵抗の簡単な直列
回路を接続することにより、電流入力信号から、
変換器内の電子回路部の直流電源と、入力電圧信
号の双方を分離して取り出すことができ、別途直
流電源部を設ける必要がなくなり、回路構成を簡
素化できる。 As explained above, according to the present invention, by connecting a simple series circuit of a Zener diode and a resistor to the input terminal into which a current signal such as a standard signal for process control is input,
Both the DC power source of the electronic circuit section in the converter and the input voltage signal can be taken out separately, eliminating the need to provide a separate DC power source section and simplifying the circuit configuration.
図面は本発明実施例を示す回路図と空気の配管
系統図を併記した図である。
１，２……入力端子、３……入力回路、４，
５，９，１０……電子回路、Z1……ツエナーダイ
オード、Rs……抵抗、＋Ｖ，−Ｖ……電子回路用
直流電源。
The drawing is a diagram showing both a circuit diagram and an air piping system diagram showing an embodiment of the present invention. 1, 2...Input terminal, 3...Input circuit, 4,
5,9,10...Electronic circuit, Z1 ...Zener diode, Rs...Resistor, +V, -V...DC power supply for electronic circuit.
Claims (1)
ダイオードと抵抗の直列回路を接続して、そのツ
エナーダイオードの両端から当該変換器の電子回
路用直流電源を得るとともに、上記入力信号によ
り上記抵抗の両端に生じた電圧信号を当該変換器
の入力回路に導くよう構成された２線式変換器。1. A series circuit of a Zener diode and a resistor is connected between the input terminals into which a current signal is input, and a DC power source for the electronic circuit of the converter is obtained from both ends of the Zener diode, and both ends of the resistor are connected by the input signal. A two-wire converter configured to direct a voltage signal generated at the converter to an input circuit of the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13682781A JPS5839399A (en) | 1981-08-31 | 1981-08-31 | 2 wire converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13682781A JPS5839399A (en) | 1981-08-31 | 1981-08-31 | 2 wire converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5839399A JPS5839399A (en) | 1983-03-08 |
| JPH0243234B2 true JPH0243234B2 (en) | 1990-09-27 |
Family
ID=15184424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13682781A Granted JPS5839399A (en) | 1981-08-31 | 1981-08-31 | 2 wire converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5839399A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5429665A (en) * | 1977-08-09 | 1979-03-05 | Ricoh Co Ltd | Data collecting system |
-
1981
- 1981-08-31 JP JP13682781A patent/JPS5839399A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5839399A (en) | 1983-03-08 |
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