JPS60126893U

JPS60126893U - 2 wire transmitter

Info

Publication number: JPS60126893U
Application number: JP1447284U
Authority: JP
Inventors: 木村　惇
Original assignee: 横河電機株式会社
Priority date: 1984-02-03
Filing date: 1984-02-03
Publication date: 1985-08-26

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１菌は従来の２線式伝送器の一例を示す回路構成図、
第２図は本考案の一実施例を示す回路構成図、第３図は
その動作説明図である。１・・・変換回路、２・・・演算増幅器、３・・・出力
トランジスタ、４・・・カレントミラー回路、５．　６
−＊１スイッチ手段、１０・・・第２スイッチ手段、７
・・・比較器、訃・・ノアゲート、９・・・単安定回路
、Ｃ□・・・コンデンサ、Ｔ１．Ｔ２・・・出力端子、
１１，１゜・・・伝送線、ＲＬ・・・負荷、ＥＢ・・・
直流電源。鴫The first bacterium is a circuit diagram showing an example of a conventional two-wire transmitter,
FIG. 2 is a circuit configuration diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of its operation. 1... Conversion circuit, 2... Operational amplifier, 3... Output transistor, 4... Current mirror circuit, 5. 6
-*1 switch means, 10... second switch means, 7
... Comparator, ... Noah gate, 9 ... Monostable circuit, C□ ... Capacitor, T1. T2...output terminal,
11,1゜...Transmission line, RL...Load, EB...
DC power supply. Shizuku

Claims

[Scope of utility model registration request]

It has a pair of output terminals, and is supplied with power from a remote point via two transmission lines connected to the output terminals, and the current flowing through the transmission lines is made to correspond to the process quantity to be measured. In a wire transmitter, a skewer transistor is connected between the output terminals to control the current flowing through the transmission line, a capacitor has one end connected to one of the output terminals, and a capacitor is connected to the other end of the capacitor. a first switch means for charging or discharging the capacitor with a current related to the current flowing through the transmission line or discharging to one of the output terminals according to a duty cycle signal related to the flow rate; A comparator that monitors and inverts at a constant set value, a gate circuit that inputs the comparator output and the above duty cycle signal, a monostable circuit that is triggered by the above duty cycle signal, and a monostable circuit that inputs the output of this monostable circuit. A two-wire transmitter comprising: second switch means that opens and closes with the output of the gate circuit; and an amplifier that amplifies the difference between a signal obtained by smoothing the output of the switch means and controls the output transistor.